Association between sleep disorders and subsequent chronic spontaneous urticaria development: A population-based cohort study

Sleep quality in patients with chronic spontaneous urticaria and relation with Orexin-A, leptin, and ghrelin

Background: Sleep can be affected in patients with chronic spontaneous urticaria (CSU). The mechanisms of sleep regulation remain poorly understood. Orexin-A, a neuroexcitatory peptide, plays a role in coordinating sleep-wake states. Ghrelin and leptin are involved in sleep regulation through the orexin system. Objective: The effects of orexin-A, ghrelin, and leptin on sleep quality in patients with CSU have not been investigated. We aimed to determine the effects of CSU on sleep quality and the association between serum orexin-A, ghrelin, and leptin levels, and sleep quality in patients with CSU. Methods: Thirty-three patients with CSU and 34 sex- and age-matched controls were included in the study. Serum orexin-A, leptin, and ghrelin levels, and the Pittsburgh Sleep Quality Index (PSQI) and the Epworth Sleepiness Scale (ESS) scores were measured in patients with CSU and in the controls; also used were the chronic urticaria quality-of-life questionnaire score and the urticaria activity score used for 7 consecutive days. Results: Median (minimum-maximum) orexin-A, leptin, and ghrelin levels in patients were 385 pg/mL (90-495 pg/mL), 3.1 ng/mL (0-21.2 ng/mL), and 701.8 pg/mL (101.9-827.7 pg/mL), respectively. Median serum orexin-A and leptin levels were higher in the patients compared with the controls (p < 0.001 and p = 0.012, respectively), whereas the median serum ghrelin levels were similar to the controls (p = 0.616). The serum orexin-A level was positively correlated with ghrelin (r = 0.298, p = 0.014), PSQI sleep quality (r = 0.356, p = 0.003), and ESS (r = 0.357, p = 0.003). Conclusion: Serum orexin-A is associated with sleep quality in patients with CSU. Further studies are needed to elucidate the role of ghrelin and leptin on sleep quality in patients with CSU.

Does chronic urticaria affect quality of sleep and quality of life?

Background

Urticaria affects a wide range of daily activities and social relationships. It has a severe impact on quality of life (QOL) and causes psychological problems.

Objective

was to assess the impact of chronic urticaria (CU) on quality of sleep, the levels of depression, anxiety, QOL and their interaction with each other and their relation to disease related factors.

Patients and methods

The study included 25 patients with CU and 25 healthy controls. Urticaria Activity Score (UAS) was used for objective evaluation of the intensity of urticaria. Patients completed a 10-cm visual analogue score (VAS) indicating the overall severity of their itching over the previous 2 weeks. The Dermatology Life Quality Index (DLQI) was used to evaluate patients' QOL. Patients were also assessed for anxiety and depression with the Hospital Anxiety and Depression Scale (HADS). Pittsburgh Sleep Quality Index (PSQI) was used for evaluation of sleep quality and sleep disturbances.

Results

In our CU patients the mean of UAS7 score was 39.72 ± 2.76 and the mean of VAS score was 28 ± 1.34. The mean of DLQI score was 24.8 ± 4.37 indicating severe impact of QOL. CU patients had higher total HADS score when compared to controls; 72% of the patients had depression and 92% had anxiety. By using PSQI, CU patients had significantly longer sleep latency onset, shorter total sleep duration, lower sleep efficiency and higher PSQI scores compared to controls.

Conclusion

CU highly affects the QOL of patients and is associated with higher levels of anxiety, depression and poor sleep quality.

The evaluation of melatonin levels in chronic spontaneous urticaria: A case control study

Background: Although sleep disturbance is known to be common in patients with chronic spontaneous urticaria (CSU), sleep hormone levels in the blood have never before been studied in CSU. Objective: In this study, we aimed to evaluate the serum melatonin levels in patients with CSU. Methods: For the patient group, 80 patients with recently diagnosed CSU, and, for the control group, 75 healthy controls (HC) were included. The study participants' melatonin levels were measured by using the enzyme-linked immunosorbent assay method. CSU disease activity was evaluated by using the urticaria activity score-7 (UAS-7), and the quality of life was assessed with the chronic urticaria quality of life questionnaire (CU-Q2oL). The patients with concomitant diseases likely to affect the melatonin levels or those using related medications were excluded from the study. Results: The patient group consisted of 53 female subjects (67%); the median (interquartile range) age was 34 years (27-43 years). The levels of melatonin were lower in the patients with CSU when compared with the HCs (p < 0.03). The melatonin levels had no significant relationship between UAS-7 and the total scores in CU-Q2oL (p > 0.05). However, a significant negative correlation in the melatonin levels was observed with questions 7 (overall sleep assessment) and 11 (difficulty in falling into sleep) in the CU-Q2oL (r = -0.55 [p < 0.001] and r = -0.62 [p < 0.001], respectively). Conclusion: The presence of low melatonin levels in the patients with CSU suggests that melatonin has a key regulatory role in the CSU development in addition to the deterioration in sleep quality. A new treatment strategy to increase the melatonin levels in CSU may be pursued in further studies to confirm our findings.

Association of pruritus with sleep in patients with psoriasis and chronic spontaneous urticaria: A cross-sectional study

Background

Pruritus is a frequent complaint associated with various inflammatory dermatoses. Sleep is often disturbed because of pruritus but the impact of severity and diurnal pattern of pruritus has not been studied so far.

Objectives

To estimate the prevalence of nocturnal itch (NI) and its association with itch severity, sleep disturbance and quality of life (QoL) compared with non-NI in chronic plaque psoriasis (CPP) and chronic spontaneous urticaria (CSU).

Methods

We performed a cross-sectional study in patients aged ≥18 years with CPP or CSU for at least 6 weeks. A comprehensive in-house questionnaire designed for study formed the basis for categorizing patients into NI and non-NI. Validated instruments like visual analog scale, pruritus grading system, General Sleep Disturbance Scale, and Dermatology life quality index were used to assess itch severity, sleep, and QoL.

Results

A total of 255 patients (CPP: 131; CSU: 124) were included in this study. Prevalence of NI was 43.5% (95% confidence interval: 34.9%-52.4%) in CPP and 29% (95% confidence interval: 21.2%-37.9%) in CSU. NI was strongly associated with higher pruritus grading system scores in CSU and CPP (regression coefficient = 1.5, P =0.004 and regression coefficient = 1.3, P =0.004, respectively), with impaired sleep (OR = 2.97, P = 0.025) in CPP and with itch-affected sleep in CSU. Itch severity was associated with impaired sleep; however, the association was modified by the presence of NI in CSU patients.

Conclusion

Nocturnal itch is prevalent in chronic dermatoses and significant for sleep deficit and impaired QoL. Early screening and management of sleep disturbance among patients presenting with nocturnal itch should be routinely undertaken.

Sleep disorders in dermatology - a comprehensive review

Sleep is a normal physiological process that accounts for approximately one third of a person's life. Disruption of the normal sleep cycle, which maintains physiological homeostasis, can lead to pathology. It is not known whether sleep disturbance causes skin disease or skin disease causes sleep impairment, but a bidirectional influence is suspected. We have compiled the data from published articles on "sleep disorders in dermatology" in PubMed Central from July 2010 to July 2022 (with the option "full text available") and provide an overview of sleep disorders associated with dermatological conditions and certain drugs used in dermatology as well as sleep disturbances for which some drugs used can cause itch or dermatological issues. Atopic dermatitis, eczema and psoriasis have been shown to be exacerbated by sleep problems and vice versa. Sleep deprivation, night-time pruritus and disrupted sleep cycles are often used to assess treatment response and quality of life in these conditions. Some medications used primarily for dermatological conditions have also been associated with alterations in the sleep-wake cycle. Addressing patients sleep disorders should be an integral part of the management of dermatological conditions. More studies are needed to further investigate the influence of sleep and skin disorders.

Cardiac Dysautonomia, Decreased Baroreflex Sensitivity and Increased Myocardial Workload in Patients with Chronic Spontaneous Urticaria: A Preliminary Report

Background

Chronic stress, a potential risk factor for cardiac autonomic dysfunction and cardiovascular (CV) risk, is known to induce the onset and exacerbation of chronic spontaneous urticaria (CSU), a psychodermatological disorder. However, data regarding CV risks due to the stress associated with CSU are very limited.

Aims and Objectives

This study aimed at comparing the cardiac sympathovagal balance (SVB), inflammatory markers, perceived stress and quality of sleep in patients with CSU (test group) and normal subjects (control group). In addition, it also aimed at assessing the correlation between the SVB and other study parameters in individuals with CSU.

Materials and Methods

Thirty-four patients with CSU and twenty-eight age- and gender-matched healthy controls were recruited for the study. Heart rate variability (HRV), baroreflex sensitivity (BRS) and biochemical markers of stress and inflammation (s-cortisol, interleukin (IL)-6, IL-18 and high sensitivity C-reactive protein (hs-CRP)) were assessed following standard procedures. Perceived stress and sleep quality were assessed using pre-validated questionnaires. Study parameters were compared between the test and control groups using the independent-samples Student's t-test or Mann-Whitney U-test. The correlation between SVB and other study parameters was assessed using Spearman's rank correlation coefficient test. P < 0.05 was considered statistically significant.

Results

Levels of perceived stress, inflammatory markers, mean arterial pressure (MAP), myocardial workload (rate pressure product (RPP)), and HRV indices indicative of cardiac sympathetic activity were significantly high in individuals with CSU. In contrast, BRS and HRV indices indicative of parasympathetic activity and sleep quality were significantly low in these individuals. There was no significant correlation between SVB and other study parameters.

Conclusions

Patients with CSU have cardiac dysautonomia characterised by increased sympathetic activity and decreased parasympathetic activity. Also, the reduced BRS and increased RPP point towards an increased risk of CV morbidity in these individuals.

Common but neglected problem in chronic spontaneous urticaria: Sleep disturbance

Background: Association of chronic spontaneous urticaria (CSU) with sleep disturbance has not been evaluated in studies that involve a large number of patients. Objective: In this study, we aimed to evaluate the sleep attitude and circadian rhythm in patients with CSU. Methods: As the patient group, recently diagnosed 100 patients with CSU, 100 patients with allergic rhinitis (AR) as the patient control group, and 100 healthy controls (HCs) were included. The Pittsburgh Sleep Quality Index (PSQI) questionnaire, sleep hygiene index (SHI), Epworth Sleepiness Scale (ESS) questionnaire, and the morningness-eveningness questionnaire (MEQ) were filled to assess sleep quality and circadian rhythm. CSU disease activity was evaluated by urticaria activity score-7 (UAS-7). Patients with concomitant diseases, e.g., psychiatric illnesses, that possibly affect sleep status or those who use related medications and at moderate or high risk of obstructive sleep apnea according to the STOP-Bang questionnaire were excluded from the study. Results: PSQI, SHI, and ESS scores were higher, and the MEQ score was lower in patients with CSU and patients with AR than those in the HCs (p < 0.001, for each score). However, the scores were not different among the patients with CSU and the patients with AR. UAS-7 was only correlated with PSQI scores (r = 0.402, p < 0.001). In addition, blood eosinophil counts and the serum C Reactive Protein (CRP) level were correlated with sleep quality (p = 0.02). Conclusion: The poor sleep quality, impaired sleep hygiene, increased daytime sleepiness, and intermediate type of circadian rhythm were observed in the patients with CSU and the patients with AR. Physicians should be aware of sleep problems in patients with CSU that might affect their quality of life and the success of their treatment.

Relationships between quality of life, sleep problems, and sleep quality in patients with chronic idiopathic urticaria

BACKGROUND

In this study, we aimed to evaluate the sleep quality among chronic urticaria patients using the Chronic Urticaria Quality-of-Life Questionnaire (CU-Q2oL), sleep quality assessment tools, and polysomnography and to investigate any relationships between the obtained results.

METHODS

The study included 21 patients diagnosed with chronic spontaneous urticaria and 19 healthy controls. We recorded the patients' sleep quality data, including CU-Q2 oL, Epworth Sleepiness Scale (ESS), Pittsburgh Sleep Quality Index (PSQI), and polysomnography results.

RESULT

Patients in the chronic urticaria group were more likely to have an ESS score of ≥10 (52.4% vs. 5.3%, p = 0.004) and an apnea-hypopnea index of ≥5 (44.4% vs. 5.3%, p = 0.017) compared to the control group. In the patient group, the CU-Q2 oL total score was positively correlated with sleep latency (r = 0.713, p = 0.004) and PSQI-C1 score (r = 0.726, p = 0.005), while it was negatively correlated with urticaria duration (r = -0.579, p = 0.015), apnea-hypopnea index (r = -0.607, p = 0.021), longest apnea duration (r = -0.583, p = 0.029), total number of respiratory events (r = -0.618, p = 0.018), and apnea count (r = -0.686, p = 0.007).

CONCLUSION

We conclude that sleep-related problems exist among a considerably large proportion of patients with chronic spontaneous urticaria.

Efficacy of acupuncture treatment for chronic spontaneous urticaria: study protocol for a randomised controlled trial

INTRODUCTION

Chronic spontaneous urticaria (CSU) is a troublesome dermatological problem that can have a significant impact on quality of life. Previous studies have indicated that acupuncture may be beneficial for patients with CSU. However, well-designed studies determine the effects of acupuncture on CSU are rare. The aim of this study is to investigate the efficacy and safety of acupuncture treatment for patients with CSU.

METHODS AND ANALYSIS

This study is designed as a multicentre, parallel, three-arm, randomised, sham-controlled trial. A total of 330 patients diagnosed as CSU will be randomly allocated into three groups: the verum acupuncture group, the sham acupuncture group and the waiting-list control group in a 1:1:1 ratio. Patients in the verum and sham acupuncture groups will receive 16 treatment sessions over 4 weeks, while patients in the waiting-list control group will not receive any acupuncture treatment. The primary outcome is the changes of weekly urticaria activity scores at the end of treatment. Secondary outcomes include itching severity measurement, Dermatology Life Quality Index, Hamilton Depression Scale, Hamilton Anxiety Scale, Pittsburgh Sleep Quality Index and serum total IgE level. Adverse events will be recorded during the study observation period. All patients who are randomised in this study will be included in the intention-to-treat analysis.

ETHICS AND DISSEMINATION

Ethical approval of this study has been granted by the Sichuan Regional Ethics Review of Committee on Traditional Chinese Medicine (TCM) (ID: 2019 kl-006), the Medical Ethic Committee of the First Hospital of Wuhan (ID: (2019) number 7)) and the Medical Ethics Committee of the First Hospital of Hunan University of TCM (ID: HN-LLKY-2019-017-01/03) in three clinical centres in China, respectively. The results will be disseminated through peer-reviewed journals.

TRIAL REGISTRATION NUMBER

ChiCTR1900022994.

Association between the severity of chronic spontaneous urticaria and sleep-disordered breathing

BACKGROUND

Chronic spontaneous urticaria (CSU) is a common mast cell-driven disease, presenting with wheals, angioedema, or both. Sleep-disordered breathing (SDB) is also a common condition and contributes to various diseases by causing chronic inflammation. Recent studies have suggested an association between CSU and SDB.

METHODS

To determine the association between the severity of SDB and that of CSU, we studied consecutive patients with CSU who visited the Sagamihara National Hospital allergy department or dermatology department between April 1 and October 31, 2018. The severity of CSU and SDB was evaluated based on the urticaria activity score 7 (UAS7) and peripheral arterial tone apnea-hypopnea index (pAHI) derived from out-of-center sleep testing (OCST) findings, respectively; their correlation was examined.

RESULTS

Of the 37 patients studied, 19 had symptom-free-to-mild CSU (UAS7 ≤15) and 18 had moderate-to-severe CSU (UAS7 ≥16). The pAHI in the latter group was significantly higher than that in the former group (18 vs. 4.2, p = 0.001). In multivariate logistic analysis, moderate-to-severe SDB (pAHI ≥15) was significantly associated with moderate-to-severe CSU even after adjusting for the BMI (adjusted odds ratio 22 [95% confidence interval, 1.7-285]).

CONCLUSIONS

The severity of SDB is correlated with that of CSU independently of the BMI. Physicians should consider comorbid SDB when treating patients with CSU.

Insomnia and other sleep disorders in dermatology patients: A questionnaire-based study with 634 patients

Insufficient sleep duration and quality are associated with various adverse health outcomes. Whereas sleep disorders have been studied in a few skin conditions, data in a more comprehensive dermatology population are lacking. We sought to describe the prevalence, causes, and consequences of sleep disorders in dermatology patients. In this cross-sectional, single-center study, dermatology patients completed a questionnaire addressing skin-related and non-skin-related health, sleep behavior, causes, and consequences of sleep disorders. According to the Regensburg Insomnia Scale, 27.92% of the 634 participants had insomnia (177 of 634 patients). Of these 177 patients, 115 (64.97%) were subjectively sleep disturbed, with skin-related causes accounting for 55.65% (64 of 115 patients), non-skin-related accounting for 33.04% (38 of 115 patients), and combined accounting for 11.30% (13 of 115 patients). Itch was the leading cause of skin-related sleep disorders (64.49%, 50 of 77 patients), followed by skin-related pain (55.84%, 43 of 77 patients) and skin-related fearful thoughts (54.55%, 42 of 77 patients). Sleep disorders reduced daytime performance in 68.70% (79 of 115 patients) and sleep quality of relatives in 20.87% (24 of 115 patients). The prevalence of insomnia among different diagnostic categories ranged from 20.31% to 50.00%. The most common strategy to improve sleep was taking sleep medication (57.39%, 66 of 115 patients). We conclude that sleep disorders are highly prevalent in dermatology patients, often leading to reduced daytime performance, impaired sleep among the patients' relatives, and increased use of substances.

"Chronic urticaria and obstructive sleep apnea: Is there a significant association?"

Background

Few studies have explored the association between obstructive sleep apnea (OSA) and chronic urticaria (CU). Our study aims to fill this gap by determining the frequency of the risk categories for OSA and how they might correlate with the specific CU patient reported outcome measures urticaria activity score (UAS7), urticaria control test (UCT) and CU quality of life questionnaire (CU-Q2oL).

Methods

We conducted a cross-sectional study involving a cohort of 171 Latin American CU patients. Descriptive statistics were used to determine frequency and proportions for demographic and clinical variables, while a chi-squared test for association between STOP-Bang OSA questionnaire categories and both UAS7 and UCT categories was performed to analyze how such variables interact. To further assess the strength of the correlation a Cramer's V coefficient was reported. Finally, a Kendall-Tau b correlation coefficient was performed to measure the correlation between the STOP-Bang score and other independent continuous variables.

Results

The average STOP-Bang score was 2.5, with 24% and 21% of patients falling into the intermediate and high-risk category for moderate-to-severe OSA, respectively. There was a strong statistically significant association (Cramer's V = 0.263; p = .000) between UAS-7 categories and STOP-Bang risk categories. A similar pattern of strong significant association (Cramer's V = .269; p = .002) was observed between UCT categories and STOP-Bang risk categories. A weak positive correlation between the STOP-Bang score and the CU-Q2oL average score (τ_b = 0.188, p = .001) was identified. Overall, 72.5% patients reported limitations with respect to sleep in a varied degree according to the CU-Q2oL.

Conclusions

Our results suggest that a considerable proportion of patients with CU are at intermediate to high risk for OSA. Higher disease activity, poor CU control, and worse quality of life were all found to be associated with an increased risk. Additional studies are needed to determine the exact link between these conditions, and to determine whether screening and treatment for OSA might benefit patients with CU.

Risk of chronic spontaneous urticaria in reproductive-aged women with abnormal uterine bleeding: A population-based cohort study

Women with abnormal uterine bleeding (AUB) have been reported to develop chronic spontaneous urticaria (CSU). Nevertheless, whether or not AUB women have an increased risk of CSU has not been examined in large-scale epidemiologic studies. This study aimed to investigate the risk of CSU among reproductive-aged women with AUB. A total of 79 595 patients and 79 107 propensity-score matched controls were recruited from Taiwan's National Health Insurance Research Database to conduct a nationwide cohort study. The Cox proportional-hazard regression model was applied to examine the adjusted hazard ratios (aHR) and 95% confidence intervals (CI) for CSU in relation to AUB. We found that women with AUB had a higher risk for CSU (aHR = 1.83; 95% CI, 1.76-1.90) than women without AUB. Subgroup analyses revealed that AUB with an abnormal bleeding frequency (aHR = 1.70; 95% CI, 1.60-1.79), irregular bleeding (aHR = 1.80; 95% CI, 1.71-1.89), and intermenstrual bleeding (aHR = 1.65; 95% CI, 1.49-1.83) were associated with an increased risk of CSU compared with those without abnormalities. The Kaplan-Meier analysis revealed that the cumulative incidence of developing CSU was consistently higher in the AUB cohort than in the non-AUB cohort during the entire follow-up period (log-rank test, p < 0.001). In conclusion, reproductive-aged women with AUB were found to have a higher risk of developing CSU. This study emphasizes the importance of enquiring CSU patients about menstrual problems in clinical practice. Further consultation with obstetrician-gynecologists may be beneficial.

How to Measure Disease Activity, Impact, and Control in Patients with Recurrent Wheals, Angioedema, or Both

Chronic spontaneous urticaria and chronic inducible urticaria are characterized by wheals, angioedema, or both, whereas other conditions such as hereditary angioedema present only with angioedema. The unpredictability of outbreaks, disfigurement, pruritus, and associated sleep and work disturbance can cause a significant impact on quality of life (QoL). Significant breakthroughs in the understanding of these conditions in recent years have led to the development of novel therapies. Assessment of patients with these conditions not only focuses on the clinical activity of the condition, but also on the impact on QoL and disease control with treatment. Patient-reported outcome measures, especially if sufficiently validated, give due prominence to the patient's perspective regarding disease impact and treatment outcomes. This article will review the tools readily available to assess activity, impact, and control in patients with recurrent wheals, angioedema, or both.

Peptic Ulcer Disease is Associated with Increased Risk of Chronic Urticaria Independent of Helicobacter pylori Infection: A Population-Based Cohort Study

BACKGROUND

Some studies showed patients with chronic urticaria have a higher rate of peptic ulcer disease (PUD). Whether PUD is a risk factor for chronic urticaria is unclear.

OBJECTIVE

The objective of this study was to evaluate the incidence of and risk factors for chronic urticaria in patients with PUD using the Taiwan National Health Insurance Research Database.

METHODS

We conducted a retrospective nationwide cohort study of the period 2000-2012 and involving 11,901 patients with PUD who underwent Helicobacter pylori (HP) therapy (PUD + HP group) and an equal number of matched patients without HP infection (PUD - HP group). Furthermore, we enrolled 23,802 patients without PUD for comparison (non-PUD group). The Cox proportional hazards regression model was used to analyze chronic urticaria risk after adjusting for potential confounding factors.

RESULTS

The mean ages of the three groups were around 50 years. Approximately 42.6% were female. Chronic urticaria incidences in the PUD + HP and PUD - HP groups were both significantly higher than that in the non-PUD group. The hazard ratios of chronic urticaria in the PUD + HP group and the PUD - HP group were 1.34 (95% confidence interval 1.09-1.64) and 1.45 (95% confidence interval 1.19-1.79), respectively. The risk difference became significant 2 years after patients with PUD had the HP infection tests and persisted till the end of follow-up. The risk increase was significant in patients with PUD who were female or aged 40-64 years. There was no difference in the risk comparison between PUD + HP and PUD - HP groups.

CONCLUSIONS

Peptic ulcer disease, independent of HP infection, is associated with an increased chronic urticaria risk. Patients with PUD who were female or aged 40-64 years are more likely to have chronic urticaria.

Risk factors of chronic urticaria among nurses with insomnia: A nationwide population-based study

Chronic urticaria has a high economic burden and reduces patient's quality of life. Nurses experience insomnia because of their shifting work, especially if they work night shifts and 3-shift rotational schedules. This study aimed to examine whether insomnia is a risk factor of chronic urticaria in nurses.Data were obtained from the Registry for Medical Personnel, which contains all registered medical staff between 2007 and 2008. All study subjects were divided into those with insomnia and without insomnia. The primary exposure of interest was chronic urticaria. In addition, potential comorbidities including diabetes mellitus, hypertension, hyperlipidemia, anxiety, and depression were estimated.A total of 103,242 registered nurses between 2007 and 2008 were enrolled. Around 97,899 (94.8%) nurses did not have insomnia, and 5343 (5.2%) had insomnia. The proportion of chronic urticaria in nurses with insomnia was significantly higher than those without (0.92% vs 0.50%, P < .0001). The odds ratio of chronic urticaria in nurses with insomnia was 1.67 (95% confidence interval: 1.22-2.29, P = 0.0014) compared to those without insomnia after adjusting for age, sex, hospital level, and comorbidities.The risk of chronic urticaria was higher in nurses with insomnia than in those without insomnia. The relationship between insomnia and chronic urticaria might not be a direct causal association. Other contributing factors of insomnia include different perceptions of stress from night shift work, stress coping and adaptation, positive self-image, and emotional equilibrium related to person's capacity to adapt to change. The same situation may have different effects on different individuals.