Sleep and delinquency: does the amount of sleep matter?

Integrating work and sleep to understand work-life balance among healthcare professionals: A conservation of resources perspective

Healthcare professionals sacrifice their sleep for increased patient care. However, this could be detrimental to their selves and the quality of healthcare service. This study used the Conservation of Resources Theory (COR) to examine the integration between the workaholic tendency of healthcare professionals and their daily sleep deprivation to determine the extent of their self-balance. The researchers used a time-lag design to measure the workaholic tendency of healthcare professionals (Total = 422 of 282 doctors and 140 nurses), observed their sleep patterns over one working week, and obtained their ratings of self-life balance. This study revealed that the relationship between workaholism and sleep deprivation and the relation between sleep deprivation and work-self balance was significant for doctors only. However, the mediating role of daily sleep deprivation between workaholism and self-balance was non-significant. This study offers some practical implications by highlighting the positive role of work and the negative role of daily sleep deprivation in maintaining self-balance for healthcare professionals.

Changes in Restless Sleep, Self-Control, and Alcohol-Related Problems with Police from Late Adolescence to Adulthood

Sleep quality is crucial for healthy adolescent brain development, which has downstream effects on self-control and involvement in risky behaviors, such as alcohol use. While previous studies have found that sleep and facets of self-control are associated with patterns of alcohol use, few have assessed whether these constructs are tied to alcohol-related problems with law enforcement during the transitional period from adolescence to adulthood. The current study uses self-report panel data from ages 16 to 27 from a population-based sample of U.S. youth (N = 956; 36.86% female). The goal of the current study is to assess the association between changes in restless sleep, impulsivity, sensation seeking, and problems with police during or shortly after consuming alcohol from adolescence to adulthood to begin to address this gap in the existing literature. Results from a multivariate latent growth curve model reveal that faster increases in restless sleep and slower declines in impulsivity are associated with slower declines in police contact. Correlated changes between restless sleep, impulsivity, and police contact are slightly greater from ages 16-21 than for ages 22-27, with males showing stronger associations. The reported results suggest that identifying developmental mechanisms between changes in poor sleep, impulsivity, and alcohol use behaviors during this life-course phase will be crucial moving forward to help divert youth away from alcohol-related contact with the police.

Exploring the relationship between sleep and aggression in adolescents: A cross sectional study using the UK Millennium cohort study

This study aimed to establish if a significant relationship exists between sleep and aggression in a large representative adolescent cohort and explores the impact of potential confounders. This cross-sectional secondary data analysis included 10,866 males and females aged 13-15 years, from the UK-based 2015 Millenium Cohort Study (sixth sweep). Independent variables included self-report measures of sleep duration and quality. The parent reported 'Strengths and Difficulties Questionnaire' conduct score measured aggression. Binary logistic regression examined independent associations between each sleep variable and aggression. Multiple regression models then adjusted for potential confounders: age, sex, socioeconomic status, arousal, and affect. Under 8 hours of sleep on average was significantly associated with aggression when age, sex and income were controlled (p = .008). This became insignificant following adjustment for both affect and arousal. Sleep quality remained significantly associated with aggression when all confounders were controlled: 'sleep onset latency >30 minutes' and 'wakening at least a good bit of the time' increased the odds of aggression by around 27.9% (p < .001) and 43.5% respectively (p < .001). A significant association exists between poor subjective sleep quality and heightened aggression in this cohort, when all our confounders are controlled, identifying sleep quality as a potential target in treating adolescent aggression.

Improving adolescent sleep in long-term Juvenile correctional settings: case examples with clinical, research, and policy implications

Poor sleep during adolescence is a public health concern that may be especially important to address among youth in juvenile correctional facilities, who tend to experience greater mental health challenges, substance use disorders, and traumatic stress exposure. However, evidence for addressing sleep in correctional settings is limited. Using de-identified composite clinical cases, this paper describes challenges and opportunities for addressing sleep disorders (i.e. insomnia) and promoting sleep health (i.e. improving duration, regularity, and behaviors) among adolescents in long-term juvenile correctional facilities. These clinical cases highlight common presenting problems and underscore the need for integrated sleep and mental health interventions as well as adaptations to enhance feasibility and efficacy of behavioral sleep treatment and sleep health promotion in juvenile correctional contexts. We conclude by summarizing clinical, research, and policy implications for addressing adolescent sleep problems and promoting sleep health and well-being in these contexts.

Sleep and circadian health in juvenile justice systems: A descriptive analysis

OBJECTIVE

Few studies have explored sleep health and environmental influences on sleep and circadian health within juvenile justice facilities. The current study aims to describe sleep and circadian health of adolescents living in detention and treatment facilities.

METHODS

Youth (N = 62) were recruited from 11 Department of Juvenile Services facilities. They completed a novel Youth Sleep and Daytime Behavior Questionnaire, daily sleep diary for seven consecutive mornings, and a brief poststudy interview. Healthcare staff completed a Youth Health Background survey for each participating youth. Facilities' 24-hour schedules were also obtained.

RESULTS

Descriptive analyses were performed to capture the youths' sleep-wake experience while residing in Department of Juvenile Services facilities. Youth are obtaining the recommended total sleep time (M=8.9 hours, SD=1.2 hours) of 8-10 hours per night. However, they are taking twice as long to fall asleep (M=47 minutes SD=59 minutes) compared to the recommended sleep onset latency of 10-20 minutes. Youths' perceptions reveal potential reasons for long sleep onset latencies, including early facility sleep-wake schedules (78%) and overhead lights (60%) remaining on throughout the night. Furthermore, 37% of youth received facility-ordered behavioral sleep assessments, 36% were taking exogenous melatonin, and the majority of youth were prescribed at least one psychotropic medication.

CONCLUSIONS

Findings suggest sleep-wake schedules and light exposure may be associated with an increase in symptoms of insomnia and/or circadian dysregulation. Based on the findings, facility-wide interventions are needed to improve the youths' sleep health.

Sleep duration, sleep quality, and weapon carrying in a sample of adolescents from Texas

Objectives

Studies are beginning to document an association between sleep duration and a range of adolescent delinquent behaviors, including weapon carrying. However, little is known about whether and to what extent sleep quality - another dimension of sleep for healthy adolescent functioning - is associated with weapon carrying. We address this gap in knowledge by evaluating the role of restless sleep and sleep duration in adolescent weapon carrying.

Methods

We analyze data from a diverse sample of 994 adolescents from Texas, USA collected in 2010. Multivariate logistic regression models estimate the association of sleep duration and restless sleep on weapon carrying after controlling for theoretical covariates and demographic characteristics.

Results

Adolescents sleeping 4 h or less on school nights were more than twice as likely to report carrying a weapon (OR = 2.38, 95% CI = 1.16-4.89, p =.018). Sleeping 5-6 h was associated with higher odds of carrying a weapon, while 6-7 h and 8 or more hours were associated with lower odds; however, all associations were non-significant. Restless sleep was associated with weapon carrying at the bivariate level (Pearson χ2 (3) = 10.56, p =.014), but not at the multivariate (OR = 1.10, 95% CI = 0.91-1.32, p =.299).

Conclusions

Our findings align with previous research demonstrating that sleeping 4 or less hours increases the likelihood of adolescent weapon carrying. Restless sleep appears to play less of a role. Future research should elucidate the longitudinal pathways between sleep duration, sleep quality, and forms of adolescent weapon carrying.

Adverse childhood experiences, sleep problems, low self-control, and adolescent delinquency: A longitudinal serial mediation analysis

Several studies link adverse childhood experiences (ACEs) to delinquency. Yet, developmental sequalae accounting for this association remain unclear, with previous research limited by cross-sectional research designs and investigations of singular mediating processes. To redress these shortcomings, this study examines the longitudinal association between ACEs and delinquency as mediated by both sleep problems and low self-control, two factors which past research implicates as potentially important for understanding how ACEs contribute to antisocial behavior. Data collected from 480 adolescents (71.3% boys; 86.3% White) and their parents participating in the Michigan Longitudinal Study was used to conduct a serial mediation analysis. The association between ACEs (prior to age 11) and delinquency in late adolescence was found to operate indirectly via sleep problems in early adolescence and low self-control in middle adolescence. Nonetheless, a direct association between ACEs and later delinquency remained. Pathways through which ACEs contribute to later delinquency are complex and multiply determined. Findings indicate that early behavioral interventions, including improving sleep and self-control, could reduce later delinquency. Still, more research is needed to identify additional avenues through which the ACEs-delinquency association unfolds across development.

The promotion of sleep wellness: Resilience as a protective factor

Objectives

To evaluate the association between resilience, sleep quality, and health.

Methods

This cross-sectional study included 190 patients (Mean age = 51, SD = 15.57) recruited from the Johns Hopkins Center for Sleep and Wellness. Patients completed a modified version of the brief resilience scale (BRS) to assess characteristics of resilience and questions to assess aspects of mental health, physical health, sleep quality, and daytime functioning.

Results

Participants' average score on the BRS was 4.67 (SD = 1.32, range = 1.17-7), reflecting a high level of resilience. There was a significant gender difference in resilience levels for men (Mean = 5.04, SD = 1.14) and women (Mean = 4.30, SD = 1.38), such that men reported significantly higher levels of resilience compared to women (t (188) = 4.02, p < 0.001) [lower levels of resilience were significantly associated with higher levels of (current) fatigue and tiredness after adjusting for demographic, physical, and mental covariates. In those reporting between one and three mental health symptoms, high levels of resilience minimized the negative influence that these symptoms had on sleep quality. This minimizing effect was no longer evident in those experiencing >3 mental health symptoms, who also reported significantly higher symptoms of fatigue despite their high resilience scores.

Conclusions

This study emphasizes how resilience may affect the relationship between mental health and sleep quality in sleep patients. Resilience may further our understanding of the inter-relationships between sleep and the manifestation of physical health symptoms, a relationship that will likely heighten in relevance during personal and global crisis. An awareness of this interaction could be used as a proactive prevention and treatment strategy. In other words, incorporating methods to evaluate resilience in patients with mental illnesses regularly can be useful for predicting the potential manifestation and severity of sleep disturbance. Therefore, strategies that focus on promoting resilience could improve health and wellness.

The relationship between sleep duration and health among Pacific adolescents within New Zealand: Findings from the Pacific Islands families study

OBJECTIVE

Sleep insufficiency is bi-directionally associated with adverse behavioural, physical and mental health outcomes in paediatric populations. However, little is known about the degree of sleep insufficiency and its effect on Pacific adolescents' wellbeing.

METHODS

A cross-sectional study of 14-year old Pacific adolescents nested within a longitudinal birth cohort was conducted. Self-reported sleep duration was related to sentinel physical, mental, and risk taking behaviour measures in crude and adjusted logistic regression models. Complete case and multiple imputed analyses were conducted.

RESULTS

916 Pacific adolescents were eligible, with a mean age of 14.2 years. Valid sleep data were available from 828 (90.4%) participants, with only 220 (26.6%) meeting the recommended amount of sleep. Insufficient sleep duration was associated with significantly higher rates of depressive symptoms and risk taking behaviours. In multiple imputed analyses, increased body mass index was also significantly related.

CONCLUSIONS

Sleep insufficiency is ubiquitous among Pacific adolescents and associated with negative impacts on their health and wellbeing.

IMPLICATIONS FOR PUBLIC HEALTH

Insufficient sleep duration is amenable to change. Bespoke, culturally responsive public health strategies that draw attention to the importance of positive sleep practices are needed. Particularly, among adolescents who are at risk of experiencing the greatest burden of insufficient sleep.

Perceived sleep quality predicts aggressive offending in adolescence and young adulthood

BACKGROUND

There are profound consequences when developing youth do not get adequate sleep. Adolescents who experience poor sleep may be more likely to engage in offending behavior. While there is a documented association between the number of hours youth sleep and their likelihood of offending, it is unclear how youths' perceptions of their sleep quality contribute to offending. Further, scholars have yet to rigorously examine the relation between sleep problems and offending in young adulthood, a developmental stage, which is both critical for desistance and in which sleep may play an important role.

METHODS

Using a sample of 1,216 justice-involved male youth, this study uses within-individual longitudinal methods (fixed-effects Poisson regression models) to examine the relation between changes in perceptions of sleep quality and changes in offending behavior from ages 13 to 24.

RESULTS

Increases in sleep problems are associated with increases in offending, particularly aggressive/person-related offenses, for both adolescents and young adults. This holds true even after controlling for time-varying anxiety, substance use, and violence exposure.

CONCLUSIONS

Improving sleep quality may be critical for reducing aggressive behavior in at-risk adolescents and young adults. Interventions that address sleep quality, and not just quantity, may be particularly beneficial.

Sleep troubles in adolescence relate to future initiation of ENDS USE: A longitudinal cohort design using the PATH study waves 4.5–5 (2017–2019)

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First longitudinal study on the association between sleep trouble and ENDS use.

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Past year sleep trouble increased risk of initiating ENDS use in following year.

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Healthy sleep serves as a protective factor against ENDS uptake for youth.

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Nearly half of youths aged 12–17, experienced sleep troubles during wave 4.5.

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Sleep classes for youth/delayed school start times may help deter future ENDS use.

In a recent study, we demonstrated a relationship between self-reported sleep deprivation and youth susceptibility to initiate electronic nicotine delivery systems (ENDS) use; however, we were hampered by cross-sectional data. This study builds on our previous work by performing secondary analysis using the nationally representative Population Assessment of Tobacco and Health study datasets from wave 4.5 (2017–2018) and wave 5 (2018–2019) among respondents aged 12–17. Using a longitudinal cohort design, we assessed the extent self-reported sleep troubles at wave 4.5 related to transition from never-to-ever ENDS use by wave 5. We assessed youth who reported never having used any type of tobacco previously and who reported not using alcohol or other illicit substances the previous year. We ran four Poisson regression models on the dependent variable never-to-ever ENDS users at wave 5 and self-reported sleep troubles in the past year at wave 4.5. We controlled for demographic and sociographic factors and, in our final model, tobacco availability in home, exposure to ENDS advertising on social media, past year anxiety, depression, body mass index, physical activity, close friends that use ENDS, perceived harm of ENDS, school performance, sensation seeking, and the susceptibility of youth to initiate ENDS. Even when controlling for these factors, sleep troubles at wave 4.5 significantly and positively related to ENDS initiation by wave 5 (Past year sleep trouble: RR = 1.48 95 % CI = [1.14–1.93]). This key and novel finding has important implications for preventing youth ENDS use via protective self-care and social-environmental approaches.

A Compendium of Risk and Needs Tools for Assessing Male Youths At-Risk to and/or Who Have Engaged in Sexually Abusive Behaviors

Using a standardized, validated risk assessment tool is an integral part of risk management and should be employed to evaluate a youth who is at risk to and/or has engaged in sexually abusive behaviors. Risk and needs tools are needed to inform critical decisions about the allocation of services and the areas that should be targeted in treatment and supervision. Although practitioners have a number of published tools to their avail, it is often less practical to discover the type of tool, where to access the tool, information regarding its psychometric properties, and how to access relevant training. This paper offers a brief compendium of youth-applied risk tools specific to male youths who are at risk to and/or who have engaged in sexually abusive behaviors; specifically, a description of the tool and its psychometric properties, along with where practitioners may access these tools and any relevant training in using these tools, are summarized. In light of the challenges that exist when assessing risk among youths, caveats and considerations are also explored.

No Time for Rest: An Exploration of Sleep and Social Harm in the North East Night-Time Economy (NTE)

This article explores the problem of sleep deprivation amongst migrant workers in North East England's night-time economy (NTE). After first outlining some of the physical and psychological effects of sleep loss, the narrative then focuses on primary accounts drawn from unstructured interviews (n = 16) and short vignettes with migrant workers. The article uses a framework grounded in social harm to explicate the declining recognition afforded to sleep and recuperation among night workers, constructing this as a socially corrosive outcome of neoliberal economic relations and the cultural injunctions that accompany it. The forfeiture of sleep among workers can also form an important point of departure for exploring a nexus of harms that suffuse the nocturnal service industry for low-paid migrant workers. These can have far-reaching consequences for well-being, as they expose the fraying of labour relations in the NTE and act as an affront to the possibility of human flourishing.

Insomnia, sleep loss, and circadian sleep disturbances in mood disorders: a pathway toward neurodegeneration and neuroprogression? A theoretical review

The present paper aims at reviewing and commenting on the relationships between sleep and circadian phasing alterations and neurodegenerative/neuroprogressive processes in mood disorder. We carried out a systematic review, according to Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines, in PubMed, PsycINFO, and Embase electronic databases for literature related to mood disorders, sleep disturbances, and neurodegenerative/neuroprogressive processes in relation to (1) neuroinflammation, (2) activation of the stress system, (3) oxidative stress, (4) accumulation of neurotoxic proteins, and (5) neuroprotection deficit. Seventy articles were collectively selected and analyzed. Experimental and clinical studies revealed that insomnia, conditions of sleep loss, and altered circadian sleep may favor neurodegeneration and neuroprogression in mood disorders. These sleep disturbances may induce a state of chronic inflammation by enhancing neuroinflammation, both directly and indirectly, via microglia and astrocytes activation. They may act as neurobiological stressors that by over-activating the stress system may negatively influence neural plasticity causing neuronal damage. In addition, sleep disturbances may favor the accumulation of neurotoxic proteins, favor oxidative stress, and a deficit in neuroprotection hence contributing to neurodegeneration and neuroprogression. Targeting sleep disturbances in the clinical practice may hold a neuroprotective value for mood disorders.

Sleep deprivation and adolescent susceptibility to vaping in the United States

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Adolescent sleep deprivation is associated with susceptibility to ENDS use.

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Less than 6 h sleep relates to higher perceived likelihoods of trying ENDS.

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ENDS prevention efforts may benefit by incorporating sleep hygiene measures.

Sleep deprivation may be a contributing factor to adolescents’ willingness to experiment with substance use, including electronic nicotine devices (ENDS). While it is generally accepted that nicotine has a negative overall effect on sleep, no studies have yet explored whether sleep deprivation may contribute to adolescents’ initiation of ENDS use. The purpose of this study is to explore whether sleep deprivation is associated with adolescents’ self-reported susceptibility to initiating ENDS use in the next month. Respondents were 1,100 adolescents aged 13–17 across the United States who participated in the Vaping Attitudes Youth Perspectives Survey (VAYPS). We used logistic regression to examine cross-sectional associations between self-reported average sleep duration and self-reported likelihood of trying ENDS in the future. Results of the three logistic regression models show that adolescents who reported getting less than six hours of sleep per night were associated with greater odds of reporting any likelihood to try a vape in the next 30 days even when controlling for demographics and potential confounders (<6hrs sleep: OR = 2.63, 95% CI 1.30–5.31). Future research on the association between sleep deprivation and ENDS use among adolescents will benefit from using longitudinal approaches to better understand causality.

Suicide Risk, Self-Injury, and Sleep: An Exploration of the Associations in a Sample of Juvenile Justice Involved Adolescents

Court-involved youth living in the community represent a vulnerable, yet understudied, group that is at risk for a variety of concerning outcomes including increased suicidal ideation, suicide attempts, and non-suicidal self-injury (NSSI). Additionally, sleep disruption, which has been associated with an increase in impulsive decision making, appears to be disproportionately high in this population. However, little is known about any connection between poor sleep and increased suicide risk and NSSI in a group of youth. This study explores the associations between sleep disruption, suicidal ideation, suicide attempts, and NSSI in a sample of court-involved youth in the community referred for mental health evaluation at a court based mental health clinic. Findings suggest that sleep disruption is related to NSSI in this population but not suicidal ideation and suicide attempts. Additional relationships were found between NSSI and being female, as well as having a lifetime history of trauma and marijuana use. Findings suggest that court clinics may wish to screen for sleep disruption as a risk factor for NSSI, and future studies may wish to explore improved sleep as a protective factor for CINI youth.

The Associations Between Objectively Measured Gait Speed and Subjective Sleep Quality in First-Year University Students, According to Gender

PURPOSE

To examine the associations between gait speed and sleep quality in first-year university students, according to gender.

METHODS

In this cross-sectional study, we recruited 193 first-year university students [mean age±standard deviation (SD): 19.6±1.1 years; mean height: 178.0±10.5 cm; mean weight: 74.0±11.0 kg; 26.9% women). Sleep quality was assessed using the Pittsburgh Sleep Quality questionnaire, with a lower score indicating "better" sleep quality. Gait speed was measured using the Zebris pressure platform. The associations were examined with generalized linear models and multiple regression analysis.

RESULTS

In the unadjusted model, faster participants had significantly "better" sleep quality (β=-3.15, 95% CI -3.82 to -2.47, p<0.001). When the model was adjusted for sex, age, body-mass index, self-rated health, smoking status, and psychological distress, faster participants remained having "better" sleep quality (β=-2.88, 95% CI -3.53 to -2.22, p<0.001).

CONCLUSION

This study shows that sleep quality can be predicted by gait speed in the first-year university students.

Violent victimisation trajectories from adolescence through adulthood: consequences for sleep problems

BACKGROUND

Violent victimisation is a stressful experience that has been linked with sleep problems among children, adolescents and adults. However, prior research has not assessed how victimisation trajectories across different stages of the life-course correspond to sleep outcomes. The present study assesses how trajectories of violent victimisation from adolescence to middle adulthood correspond to sleep behaviours in adulthood.

METHODS

Data are from fives waves of the National Longitudinal Study of Adolescent to Adult Health (N=6015). Semi-parametric group-based trajectory modelling was used to estimate violent victimisation trajectories from adolescence to middle adulthood. Multinomial logistic regression was used to assess the association between sleep quantity and quality across violent victimisation trajectories.

RESULTS

The findings demonstrate that the relationship between violent victimisation and sleep in adulthood is not consistent across all victimisation trajectories. Rather, sleep quality and quantity are the worst among those who persistently experience violent victimisation from adolescence through adulthood.

CONCLUSION

Persistent exposure to violence can be a particularly damaging experience with consequences for sleep quantity and quality. Establishing interventions that reduce violent victimisation across the life-course and promote positive sleep behaviours among those with a history of victimisation are important public health measures.

Quality over quantity? Using sibling comparisons to examine relations between sleep quality, sleep duration, and delinquency

RATIONALE

A growing body of research suggests that adolescents with problematic sleep patterns are more likely to engage in externalizing and delinquent behaviors. Few studies, however, have examined the role of between- and within-family effects on this association to establish whether poor sleep is related to delinquency after controlling for familial confounding.

OBJECTIVE

The current study examines the relationship between self-reported restless sleep, sleep duration, and delinquency from ages 16-19 in a population-based sample of U.S. youth.

METHODS

Data from full siblings from the Children and Young Adult sample of the National Longitudinal Survey of Youth (1979) (CNLSY) are analyzed. Negative binomial regression models and sibling comparisons are estimated to assess between- and within-family effects of sleep on delinquency during ages 16-17. Sibling comparison cross-lagged models are then fitted to the data to examine whether sibling differences in sleep are related to sibling differences in changes in delinquency from ages 16-19.

RESULTS

Siblings with higher levels of self-reported restless sleep were more likely to report higher levels of delinquency at ages 16-17, net of observable covariates and unobservable familial confounders. Sibling differences in restless sleep at ages 16-17 were also associated with increases in delinquency at ages 18-19 after controlling for familial confounding and temporal stability in both sleep and delinquent behavior.

CONCLUSIONS

Findings suggest that perhaps sleep quality, rather than sleep duration, should be the primary target for intervention/prevention programming efforts for adolescent delinquency.

Disentangling the Direction of Associations between Sleep and Temperament in Toddlers

OBJECTIVES/BACKGROUND

Although much research has investigated the associations between children's sleep and their temperament, the direction of these associations remains unclear, largely due to a lack of longitudinal studies with repeated assessments of both sleep and temperament. Aiming to clarify the temporal precedence of these two constructs, the current study investigated reciprocal associations between toddlers' sleep and temperament with a longitudinal design.

PARTICIPANTS

The sample consisted of 82 toddlers (39 girls) assessed twice.

METHODS

At both 2 (M = 25.23 months; SD = 1.11) and 3 years of age (M = 36.81 months; SD = 0.91), toddlers' sleep duration and quality were assessed using actigraphy and their temperament was reported by their mothers with the Toddler Behavior Assessment Questionnaire.

RESULTS

Shorter nighttime sleep duration (ß = - .28, p = .03) and lower sleep efficiency (ß = - .33, p = .01) at 2 years predicted more temperamental proneness to anger at 3 years, while greater temperamental social fear at 2 years was predictive of shorter 24-hour (ß = - .44, p = .02) and nighttime (ß = - .36, p = .04) sleep duration at 3 years. Associations between temperamental activity level and sleep variables were non-significant.

CONCLUSION

The direction of the associations between toddlers' sleep and their temperament may vary according to which dimension of temperament is considered. These findings should encourage practitioners to identify the beginning of the causal chain leading to sleep or temperamental difficulties so as to develop well-tailored intervention plans.

Sleep duration, handgun carrying, and taking a handgun to school: an analysis of a statewide sample of Florida youth

OBJECTIVES

To investigate whether sleep duration is associated with adolescent handgun carrying behaviors.

DESIGN

The Florida Youth Substance Abuse Survey (FYSAS) is a cross-sectional study of adolescents.

SETTING

The state of Florida.

PARTICIPANTS

Middle school and high school students (n = 42,182) attending public schools in 2018.

METHODS

Dichotomous measures of general handgun carrying and taking a handgun to school within the past 12 months were modeled as dependent variables. Self-reports of hours slept on an average school night were used to construct multiple indicators of sleep duration (ordinal, dichotomous, and hourly dummy variable series) to predict general handgun carrying and taking a handgun to school in logistic regression models when accounting for several covariates.

RESULTS

Adjusting for model covariates, youth who reported sleeping four or fewer hours at night had 40% greater odds of general handgun carrying than youth who reported sleeping eight or more hours. Likewise, youth who reported sleeping four or fewer hours at night had 85% greater odds of taking a handgun to school than youth who reported sleeping eight or more hours. Youth who reported sleeping five, six, or seven hours were no more likely to report handgun-carrying behaviors than youth who reported sleeping eight or more hours.

CONCLUSIONS

Among youth in Florida, severe deficits in sleep are associated with general handgun carrying as well as taking a handgun to school. More modest sleep deficits are not associated with these behaviors.

#freemind: Young Women Using Mindfulness Meditation to Cope with Life in a Juvenile Justice Institution

The purpose of this study was to introduce mindfulness meditation, a recommended adjunctive treatment for trauma in juvenile justice-involved youth, to incarcerated young women and collect narrative commentary about their experiences to answer the following research questions: What is the experience of incarcerated young women who participate in Internet-based mindfulness meditation classes? How do incarcerated young women apply mindfulness meditation to life in a juvenile justice facility? Participants attended bi-weekly guided meditation sessions and wrote about their experiences after each session in a journal. Three coders used open-coding content analysis to identify topics and themes across 38 journal entries. The primary theme, found in 61% of entries, described the difficulties of living in a juvenile justice facility, providing context for the descriptions found in 58% of entries regarding the usefulness of mindfulness meditation to cope with those difficulties. This study highlights the challenges of living in a correctional institution as a young woman and the barriers such settings pose to the wellbeing and healthy development of their residents. It also points to mindfulness meditation as an operative method of supporting these highly traumatized young women until that time when alternatives to incarceration can be identified.

Psychosocial Determinants of Insomnia in Adolescents: Roles of Mental Health, Behavioral Health, and Social Environment

The theoretical explanation of human problems is derived from the complex interplay of psychological, social, economic, political, and physical factors.

AIMS

This study examined the roles of behavioral health (i.e., alcohol abuse and suicidality) and social environment (i.e., family support, school connectedness, and favorable neighborhood) and mental health [i.e., depression, anxiety, and attention deficit hyperactivity disorder (ADHD)] in predicting insomnia in adolescents in an ecological perspective.

METHODS

Approximately 6445 high school students in Taiwan were administered an anonymous self-report survey. Hierarchical multiple regression was performed to examine how multidimensional social environment, behavioral health, and mental health factors were associated with insomnia in adolescents.

RESULTS

The prevalence rate of insomnia in the sample was 30%. The results indicated that alcohol abuse (β = 0.04), suicidality (β = 0.06), depression (β = 0.29), anxiety (β = 0.14), and ADHD (β = 0.11) were positively associated with insomnia (p < 0.001), whereas family support (β = -0.06), school connectedness (β = -0.05), and favorable neighborhood (β = -0.10) were negatively associated with insomnia (p < 0.001). Sex did not predict insomnia, but age was positively associated with insomnia (β = 0.09, p < 0.001). Among all predictors of insomnia in the study, mental health factors, especially depression, play a major role on insomnia among adolescents, and is as much important as social environment factors.

CONCLUSION

This study demonstrated how both psychosocial variables (social environment and behavioral health) and psychological symptoms were associated with insomnia in adolescents when the demographic variables (sex and age) were controlled and provided valuable information and evidence for clinicians, social workers, and health professionals who provide support to adolescents with insomnia. Applying an ecological approach in practice can aid in understanding at individual, family, school, and community levels and in identifying the strengths and weaknesses of their interactions with each other.

IMPLICATIONS

This perspective enables practitioners in effectively treating problems and addressing the needs of the various levels, including the individual, family, school, and the broader community. Thus, prevention and intervention of insomnia in adolescents should focus on multidimensional risk and protective factors, including mental health, behavioral health, and social environment, in the context of an ecological system.

Melatonin pretreatment attenuates acute methamphetamine-induced aggression in male ICR mice

Aggression is one of the symptoms of methamphetamine (MA) use and withdrawal, which can exacerbate MA addiction and relapse. Many studies have demonstrated that poor sleep is significantly associated with aggression. Melatonin has been indicated to be effective in treating sleep disorders induced by MA, and it can also protect neuronal cells against MA-induced neurotoxicity. However, the underlying effects of melatonin on MA-reduced aggression remain unclarified. This study was designed to evaluate the effects of melatonin on acute MA-induced aggressive behavior in male ICR mice and the effects on neurotransmitters related to aggression. Fifty male ICR mice were randomly assigned to control and treatment groups pretreated with MA (3 mg/kg) or melatonin (2.5, 5, 10 mg/kg) plus MA. Aggressive behaviors were observed through isolation-induced aggression in the resident-intruder model. High-performance liquid chromatography combined with electrochemical detection (HPLC-ECD) was used to anatomize the levels of dopamine (DA) and its metabolites, 3,4-dihydroxyphenyl acetic acid (DOPAC) and homovanillic acid (HVA), and the concentrations of serotonin (5-HT) and its metabolite, 5-hydroxyindoleacetic acid (5-HIAA), in the hippocampus involved in behavior processing. The results showed that acute MA administration decreased latency to initial attacks and thereby increased the number and total duration of attacks. Furthermore, HVA level as well as 5-HIAA and 5-HT turnover estimated by 5-HIAA/5-HT ratios declined compared to those in the vehicle group. The medium melatonin pretreatment dose (5 mg/kg) could significantly reverse acute MA-induced aggressive behavior in the form of prolonging latency to initial attacks and thereby attenuating the number of attacks and total duration of attacks. HVA and 5-HIAA levels, 5-HT turnover estimated by 5-HIAA/5-HT ratios, and DA turnover estimated by HVA/DA ratios and (DOPAC + HVA)/DA ratios were elevated compared to those in the MA group. These results indicate that the DA and 5-HT systems are involved in the processes of MA-induced aggressive behaviors and that melatonin has the capacity to reverse MA-induced aggressive behaviors.

Double trouble: Weekend sleep changes are associated with increased impulsivity among adolescents with bipolar I disorder

OBJECTIVES

Both sleep disruption and impulsivity are important predictors of the course of bipolar disorder (BD). Although sleep disruption has been shown to intensify impulsivity, little research has considered how these two important domains interact within BD. Adolescence is a critical period for the onset of BD, and is often associated with increases in impulsivity and substantial changes in sleep. We tested the hypothesis that disruptions in sleep would increase impulsivity among adolescents, and that this effect would be more pronounced among those with BD.

METHODS

Thirteen- to nineteen-year-olds diagnosed with BD-I (n = 33, age [mean ± standard deviation (SD)] 16.2 ± 1.66 years, 54.5% female) and psychiatrically healthy controls (n = 26, age [mean ± SD] 15.5 ± 1.45 years, 55.6% female) reported their past-week bedtime, rise time, and sleep duration, separately for school days and weekends, and completed a self-report questionnaire on impulsivity. Stepwise regression was used to examine the effects of sleep on impulsivity, and the moderation of this effect by BD status.

RESULTS

Adolescents with BD reported significantly higher impulsivity, later and more variable rise time, and more variable time in bed and sleep duration on school days than did controls. Greater change in sleep duration between school days and weekends was associated with significantly more impulsivity among adolescents with BD as compared to controls.

CONCLUSIONS

These findings highlight the important effect of sleep on impulsivity among adolescents with BD and add to the growing evidence that establishing sleep routines may be an important therapeutic target for youth with BD.

Sleep duration and risk-taking in adolescents: A systematic review and meta-analysis

Risk-taking is associated with increased morbidity and mortality among adolescents, with insufficient sleep a potential factor contributing to heightened risk-taking propensity in this age group. A systematic review of the evidence examining the relationship between sleep duration and risk-taking in adolescents was conducted using PsycINFO, PubMed, Medline, Scopus, and CINAHL databases. These searches identified 26 studies including 579,380 participants, 24 of which were appropriate for meta-analysis. Pooled results indicated that insufficient sleep was associated with 1.43 [1.26, 1.62] times greater odds of risk-taking. This relationship was witnessed across diverse categories of risk-taking, including alcohol use, drug use, smoking, violent/delinquent behaviour, transport risk-taking/road safety, sexual risk-taking and trait risk-taking. Risk of bias analysis showed that the quality of the included studies was mixed. Further, few studies utilized either longitudinal or experimental designs, thus limiting causal conclusions. These findings highlight the importance of further research to examine the causal relationship between sleep duration and risk-taking and to elucidate the mechanisms that underpin this relationship.

Adolescent Sleep Barriers: Profiles within a Diverse Sample of Urban Youth

Most adolescents face numerous obstacles to good sleep, which may undermine healthy development. In this study, we used latent class analysis and identified four categories of sleep barriers in a diverse sample of 553 urban youth (57% female). The majority profile, School/Screens Barriers, reported the most homework and extracurricular barriers, along with high screen time. The Home/Screens Barriers class (i.e., high environmental noise, light, screen use) and the High/Social Barriers class (i.e., high barriers across domains, particularly social) reported the poorest sleep quality and highest depressive/anxiety symptoms. The Minimal Barriers class-predominately male, with low depressive/anxiety symptoms-reported more sleep per night. We discuss implications of our findings for targeting interventions to address poor adolescent sleep among specific clusters of students.

Perceived school safety, perceived neighborhood safety, and insufficient sleep among adolescents

OBJECTIVES

To examine whether perceptions of school safety and neighborhood safety are associated with insufficient sleep during adolescence.

DESIGN

The Florida Youth Substance Abuse Survey (FYSAS) is a cross-sectional study of adolescents.

SETTING

The state of Florida.

PARTICIPANTS

Middle-school and high-school students (n = 7,958) attending public schools in 2017.

MEASUREMENTS

Based on National Sleep Foundation recommendations, sleep was categorized as insufficient (less than 7 hours) or sufficient (7 or more hours) using self-reports of average sleep duration on school nights. Self-reports of perceived safety at school and perceived safety in one's neighborhood were modeled as predictors of insufficient sleep in logistic regression models when accounting for several covariates.

RESULTS

Adjusting for model covariates, the odds of insufficient sleep among adolescents who feel unsafe both at school and in their neighborhood are 129% greater relative to adolescents who feel safe in both contexts. In comparison, the odds of insufficient sleep among adolescents who feel unsafe only at school are 39% greater relative to adolescents who feel safe both at school and in their neighborhood, and the odds of insufficient sleep among adolescents who feel unsafe only in their neighborhood are 71% greater relative to adolescents who feel safe both at school and in their neighborhood.

CONCLUSIONS

The findings of this study indicate that efforts to improve the safety of salient social contexts in which adolescents develop may reduce the likelihood of insufficient sleep faced by a large portion of school-aged children.

Girls' Sleep Trajectories Across the Pubertal Transition: Emerging Racial/Ethnic Differences

PURPOSE

This study aims to examine the longitudinal association between puberty and sleep in a diverse sample of girls and explore racial/ethnic differences in this association.

METHODS

Using latent growth curve modeling, the present study measured pubertal development (timing and rate) and sleep (wake time and bedtime) in 1,239 socioeconomically and ethnically diverse girls starting when they were 6-8 years old and followed longitudinally for up to 8 years. Pubertal assessment was conducted annually in clinic by physical examination, classified by sexual maturation stage for breast and pubic hair development by trained raters.

RESULTS

In line with previous research, black girls had the earliest pubertal development, followed by Hispanic, white, and Asian girls. Black girls, on average, reported significantly shorter sleep duration than Hispanic (β = -.20, p < .001), Asian (β = -.29, p = .002), and white (β = -.35, p < .001) girls. In a series of dual-process models, we found that early pubertal timing predicted shorter sleep duration for early-maturing black girls (breast development: β = .13, p = .005; pubic hair development: β = .14, p = .012). There was no evidence of any association between pubertal rate and sleep. All models controlled for family socioeconomic status and body mass index.

CONCLUSION

Sleep is essential for many aspects of youth development, including emotional, cognitive, and physical functioning. Developmental changes associated with puberty may put some early maturing girls at risk of shorter sleep duration in adolescence and exacerbate racial/ethnic disparities in health and well-being.

Do sleep problems mediate the link between adverse childhood experiences and delinquency in preadolescent children in foster care?

BACKGROUND

Adverse childhood experiences (ACEs) are associated with multiple mental and physical health problems. Yet, mechanisms by which ACEs confer risk for specific problems are largely unknown. Children in foster care typically have multiple ACEs and high rates of negative sequelae, including delinquent behaviors. Mechanisms explaining this link have not been explored in this population. Impaired sleep has been identified as a potential mechanism by which ACEs lead to delinquency in adolescents, because inadequate sleep may lead to poor executive function and cognitive control - known risk factors for delinquency.

METHODS

Interviews were conducted with 516 maltreated children in foster care, ages 9-11 years, and their caregivers regarding child exposure to ACEs, sleep problems, engagement in delinquent acts, symptoms of posttraumatic stress disorder, and current psychotropic medication use. ACEs data were also obtained from child welfare case records.

RESULTS

After controlling for age, gender, race/ethnicity, placement type (residential, kin, foster), length of time in placement, posttraumatic stress symptoms, and current psychotropic medication use, sleep partially mediated the association between ACEs and delinquency.

CONCLUSIONS

Although delinquency is likely multiply determined in this population, improving sleep may be one important strategy to reduce delinquency.

Relationships between school start time, sleep duration, and adolescent behaviors

OBJECTIVES

The objectives were 2-fold: (1) to examine how high school start times relate to adolescent sleep duration, and (2) to test associations between sleep duration and mental health- and substance use-related issues and behaviors in teens.

DESIGN

This study examines selected questions from survey data collected between 2010 and 2013 high school students.

SETTING

Respondents included more than 9000 students in grades 9 to 12 in 8 high schools in 5 school districts across the United States.

MEASUREMENTS

The survey instrument is the 97-item Teen Sleep Habits Survey. Logistic regression models were used to calculate adjusted odds ratios and 95% confidence intervals. Because of clustering within schools and the use of repeated measures, generalized estimating equations were used to account for variance inflation.

RESULTS

Greater sleep duration was associated with fewer reports of various mental health- and substance use-related issues and behaviors (all P values <.01). For instance, for each additional hour of sleep reported, there was a 28% reduction in the adjusted odds of a participant reporting that he or she felt "unhappy, sad, or depressed." Later wake-up times were associated with a reduction in risk for some, but not all factors. Later start times were significantly associated with greater sleep duration.

CONCLUSIONS

Given that later start times allow for greater sleep duration and that adequate sleep duration is associated with more favorable mental health- and substance use-related issues and behaviors, it is important that school districts prioritize exploring and implementing policies, such as delayed start times, that may increase the amount of sleep of adolescent students, which is needed for their optimal development.

The Role of Sleep in the Relationship Between Victimization and Externalizing Problems in Adolescents

Victimization is linked to externalizing outcomes in adolescents and recent theorizing suggests that sleep plays a role in this relationship; however, there is little evidence examining sleep as a mediator. This study examines associations between victimization experiences and changes in aggression, delinquency, and drug use. Data were obtained from three waves of a school-based study with middle-school youth (n = 785; 55 % female; 20 % African American; M = 12.32, SD = .51 years at T1), and path analyses were used to test the key hypotheses. Analyses controlling for major life events, demographic factors, and school site revealed that victimization indirectly affected delinquency and drug use, but not aggression, through its relationship with sleep problems. Further, the effects of sleep problems on drug use were specific to females. These data suggest that intervening to address sleep problems resulting from victimization may serve to reduce some forms of externalizing behavior.

Inadequate Sleep as a Mediating Variable between Exposure to Interparental Violence and Depression Severity in Adolescents

Exposure to violence, including interparental and peer dating violence, is a public health concern associated with negative outcomes, including depression. However, little is known about mechanisms by which exposure to violence influences depressive symptoms. One factor that may help explain this association is problematic sleep. This study sought to determine whether short sleep duration mediates the relationship between exposure to violence (interparental and peer dating violence) and depressive symptoms. Structural equation modeling was used to examine the mediating role of short sleep duration from a 3-year longitudinal study of 1,042 high school students. Results demonstrated interparental violence was negatively related to sleep duration (friends dating violence was not), and sleep duration negatively associated with depressive symptoms. Adolescents exposed to violence between their parents obtained less sleep on school nights. In turn, they reported more depressive symptoms. Short sleep duration mediated the relationship between exposure to interparental violence and depression severity.

Sleep Patterns and Academic Performance During Preparation for College Entrance Exam in Chinese Adolescents

BACKGROUND

Deficient sleep is linked to detrimental outcomes in health and school performance for adolescents. This study characterized sleep patterns in Chinese adolescents preparing for the College Entrance Exam (CEE) and evaluated the association between sleep patterns, self-rated academic performance, and the CEE scores.

METHODS

A sample of 481 Chinese adolescents in 12th grade (ages 16-19 years) completed questionnaires about sleep patterns, academic performance, academic stress, and sociodemographic factors 4-6 weeks before the CEE in June 2013. The CEE scores for each student also were obtained.

RESULTS

A total of 21% of the students had bedtimes after 12:00 am, 78.3% had sleep latency longer than 30 minutes, 14.6% had wake time earlier than 6:00 am, and the vast majority (94.4%) had sleep duration less than 8 hours. After adjusting for selected confounders such as academic stress, prolonged sleep latency was associated with poorer self-reported academic performance, and late bedtime was associated with higher CEE score.

CONCLUSIONS

Our findings highlight the complex association between sleep and academic performance. Assessing and monitoring sleep patterns in adolescents during periods of high academic demand and stress may yield important recommendations for their health and safety as well as establishing optimal sleep and study habits.

Internalizing and externalizing traits predict changes in sleep efficiency in emerging adulthood: an actigraphy study

Research on psychopathology and experimental studies of sleep restriction support a relationship between sleep disruption and both internalizing and externalizing disorders. The objective of the current study was to extend this research by examining sleep, impulsivity, antisocial personality traits, and internalizing traits in a university sample. Three hundred and eighty six individuals (161 males) between the ages of 18 and 27 years (M = 18.59, SD = 0.98) wore actigraphs for 7 days and completed established measures of disorder-linked personality traits and sleep quality (i.e., Personality Assessment Inventory (PAI), Triarchic Psychopathy Measure, Barratt Impulsiveness Scale-11, and the Pittsburgh Sleep Quality Index). As expected, sleep measures and questionnaire scores fell within the normal range of values and sex differences in sleep and personality were consistent with previous research results. Similar to findings in predominantly male forensic psychiatric settings, higher levels of impulsivity predicted poorer subjective sleep quality in both women and men. Consistent with well-established associations between depression and sleep, higher levels of depression in both sexes predicted poorer subjective sleep quality. Bidirectional analyses showed that better sleep efficiency decreases depression. Finally, moderation analyses showed that gender does have a primary role in sleep efficiency and marginal effects were found. The observed relations between sleep and personality traits in a typical university sample add to converging evidence of the relationship between sleep and psychopathology and may inform our understanding of the development of psychopathology in young adulthood.

Poor actigraphic and self-reported sleep patterns predict delinquency and daytime impairment among at-risk adolescents

OBJECTIVE

To evaluate associations between actigraphic sleep patterns, subjective sleep quality, and daytime functioning (ie, sleepiness, symptoms of depression, and delinquency and other conduct problems) in at-risk adolescents.

DESIGN

Prospective, observational cohort study.

SETTING

Providence, RI, predominantly home and school and 2 visits to the Brown Center for the Study of Children at Risk.

PARTICIPANTS

A diverse group of low-income 13-year-olds (n = 49) with and without prenatal drug exposure.

INTERVENTIONS

None.

MEASUREMENTS

Actigraphy, sleep diaries, and sleep and health questionnaires.

RESULTS

Above and beyond the effects of prenatal drug exposure and postnatal adversity, actigraphic daytime sleep was a significant predictor of daytime sleepiness and delinquency. Subjective sleep quality was a significant predictor of daytime sleepiness, delinquency, and depressive symptoms. Later bed times predicted increased delinquency.

CONCLUSIONS

There was a unique effect of actigraphic daytime sleep duration, subjective nighttime sleep quality, and bedtime on daytime functioning (ie, sleepiness, symptoms of depression, and delinquency and other conduct problems) of at-risk adolescents. In these vulnerable youth, these problematic sleep patterns may contribute to feeling and behaving poorly. Intervention studies with at-risk teens should be conducted to further explore the role of these sleep parameters on daytime functioning.

Poor sleep and reactive aggression: Results from a national sample of African American adults

BACKGROUND

We know that poor sleep can have important implications for a variety of health outcomes and some evidence suggests a link between sleep and aggressive behavior. However, few studies have looked at this relationship among African-Americans in the United States.

METHODS

Data from the National Survey of American Life (NSAL) and the NSAL Adult Re-Interview were used to examine associations between sleep duration and self-reported quality of sleep on reactive aggression among African American and Caribbean Black respondents between the ages of 18 and 65 (n = 2499).

RESULTS

Controlling for an array of sociodemographic and psychiatric factors, sleep was found to be significantly associated with reactive aggression. Specifically, individuals who reported sleeping on average less than 5 h per night were nearly three times more likely to report losing their temper and engaging in a physical fight (AOR = 3.13, 95% CI = 1.22-8.02). Moreover, individuals who reported being "very dissatisfied" with their sleep were more than two times more likely to report losing their temper and engaging in physical fights (AOR = 3.32, 95% CI = 1.50-7.33). Persons reporting everyday discrimination and problems managing stress were more likely to sleep poorly.

CONCLUSIONS

The present study is among the first to document an association between poor sleep and reactive violence among African-Americans. Findings suggest that reducing discrimination may lead to improved sleep and subsequently reduce forms of reactive violence.

School start time changes and sleep patterns in elementary school students

OBJECTIVES

Research finds significant sleep deprivation among adolescents with early school start times. This study surveyed sleep patterns in elementary school students before and after a district-wide change to earlier start times.

DESIGN

Students in grades 3-5 completed a self-administered sleep survey in the spring of 2009 (third grade, n = 216; fourth grade, n = 214; fifth grade, n = 259; total, n = 689) and again in 2010 (third grade, n = 168; fourth grade, n = 194; fifth grade, n = 263; total, n = 625), after the school start time switched from 8:20 am to 7:45 am in the Fall of 2009. Students entering grade 3 experienced a larger shift from 9:10 am to 7:45 am, due to moving from the kindergarten-second-grade building to the third-to-fifth-grade building. Descriptive statistics quantified responses by grade.

RESULTS

Prechange, wake time across all grades was similar; postchange, fourth and fifth graders woke on average 30-40 minutes earlier than children in those grades the year before, and third graders woke on average 8 minutes later. Compared to prechange, third graders reported longer average total sleep times (24 minutes); fourth and fifth graders reported average sleep times 4 and 9 minutes shorter, respectively, than students in those grades the previous year. The percentage of students in each grade reporting later weekend wake and bed times decreased postchange. Reports of sleepiness somewhat increased for fifth graders postchange.

CONCLUSIONS

School start time change did not decrease total amount of sleep. This is the first study of its kind to report on the effects of a start time change in elementary school students.

Advancing a biopsychosocial and contextual model of sleep in adolescence: a review and introduction to the special issue

Sleep problems in adolescence have been identified as an international public health issue. Over the past few decades, notable advances have been made in our understanding of the patterns and consequences of sleep in adolescence. Despite these important gains, there is much about the role of sleep in adolescence that remains to be understood. This Special Issue brings together studies that examine sleep as it specifically pertains to adolescent development and adjustment. In this introductory article, we argue for the importance of grounding the study of sleep and adolescence in developmental science and a developmental psychopathology framework. First, a review of the literature is used to outline a biopsychosocial and contextual model of sleep in adolescence. Second, attention-deficit/hyperactivity disorder (ADHD) is used as an exemplar of the proposed model given the pervasiveness of sleep problems among youth with ADHD and the likelihood that sleep problems and ADHD symptoms are interconnected in complex ways. Finally, a brief introduction to the empirical articles included in the Special Issue is provided, with particular attention given to how these articles fit within the proposed biopsychosocial and contextual model. Along with the framework proposed in this article, the studies included in this Special Issue advance the current literature and point to critical directions for future research.