Turn off that night light! Light-at-night as a stressor for adolescents

Cultural Approaches to Addressing Sleep Deprivation and Improving Sleep Health in Japan: Sleep Issues Among Children and Adolescents Rooted in Self-Sacrifice and Asceticism

This narrative review examines the issue of sleep deprivation among children and adolescents in Japan, exploring its cultural origins and evaluating the current state of sleep education and interventions. It emphasizes the profound influence of the Bushidō spirit, with its focus on self-sacrifice and asceticism, as a core factor in the undervaluation of sleep in Japanese society. While educational initiatives and interventions highlighting the importance of sleep exist, significant limitations remain in improving sleep habits. Sleep deprivation continues to affect children and adolescents, despite its considerable impact on mental health and academic performance. This review presents a method for personalized sleep duration estimation and assesses its potential impact on improving sleep health by using optimal sleep duration calculations. The review also proposes practical steps to improve sleep duration through individualized strategies, integrating cultural context to mitigate the serious health risks associated with insufficient sleep. Ultimately, it underscores the need for targeted strategies to improve sleep among children and adolescents-particularly through personalized optimal sleep duration estimation-while advocating for a shift in cultural perspective beyond self-sacrifice and asceticism. The review highlights the importance of cultural transformation and suggests future research directions and practical applications.

Consumption of dopamine receptor 1 agonist SKF-38393 reduces constant-light-induced hyperactivity, depression-like, and anxiety-like behaviors in a sex specific manner in C57BL/6J mice

Artificial light exposure during nighttime, including constant light (LL), is an increasingly prevalent environmental occurrence linked to impaired mood and cognitive impairments in both humans and animal models. Dopamine and dopamine 1 receptors are well known to modulate circadian rhythms and mood. This study investigated the effects of LL on anxiety-like, depressive-like, and cognitive behaviors in male and female C57BL/6J mice and assessed whether consumption of SKF-38393, a dopamine 1 receptor agonist, can mitigate these negative behavioral outcomes. Mice were exposed to LL or a standard 12:12 light:dark cycle (LD) for 6 weeks, with subgroups receiving either SKF-38393 or water. All mice had their circadian rhythms continuously monitored and were placed within behavioral tests that assayed their anxiety-like, depressive-like, and learning and memory behaviors. Behavioral assays revealed that LL increased hyperactivity and anxiety-like behaviors, which were mitigated by SKF-38393 consumption in both sexes. In addition, male mice exhibited anhedonia under LL, which was alleviated by SKF-38393, whereas female mice were resistant to LL-induced anhedonia. Sex differences emerged in fluid consumption independent of lighting condition, with females consuming more SKF-38393, and in responses to DA on behavior, including novel object recognition and exploration. These results indicate that low dose oral consumption of dopamine 1 receptor agonists can ameliorate some of the negative behavioral effects of LL exposure. This study highlights the complex interplay between chronic light, dopamine, and sex in influencing mood and behavior, suggesting potential modulatory roles for dopamine 1 receptor agonists in regulating behavioral outcomes to circadian disturbances.