Bedtime and Sleep Duration in Relation to Depressive Symptoms among Japanese Workers

Abstract

Bedtime and Sleep Duration in Relation to Depressive Symptoms among Japanese Workers: Nobuaki SAKAMOTO, et al. Department of Epidemiology and Prevention, Center for Clinical Sciences, National Center for Global Health and Medicine— Objectives While bedtime may influence circadian rhythms, potentially leading to depression, epidemiological data on this issue are limited. We cross‐sectionally investigated the association between bedtime and depressive symptoms in Japanese workers, taking sleep duration into consideration. Methods The participants were 1,197 workers who participated in a health survey during a periodic checkup and had no history of psychiatric disease. Depressive symptoms were assessed using the Center for Epidemiologic Studies Depression (CES‐D) scale. Usual bedtime and wake time were inquired about using a self‐administered questionnaire, and sleep duration was calculated based on the difference between these two values. Multiple logistic regression was used to estimate the odds ratio of depressive symptoms for bedtime or sleep duration categories. Results Short sleep duration (<6 hours) was significantly associated with an increased prevalence of depressive symptoms. Late bedtime was also significantly associated with an increased prevalence of depressive symptoms (CES‐D score of ≥19); the multivariable‐adjusted odds ratio of depressive symptoms for a bedtime of 1:00 or later versus 23:00 to 23:59 was 1.90 (95% confidence interval, 1.16−3.12). After additional adjustment for sleep duration, however, the association was largely attenuated (odds ratio, 1.17; 95% confidence interval, 0.66−2.06). Conclusions Late bedtime was associated with increased prevalence of depressive symptoms, but this association could be largely accounted for by short sleep duration. Avoiding a late bedtime and obtaining a sufficient sleep duration may prevent depressive mood among workers.

Sex Differences in the Relationship between Sleep Behavior, Fish Consumption, and Depressive Symptoms in the General Population of South Korea

“…For example, the Netherlands Study of Depression and Anxiety revealed that late chronotype (evening-type of sleep) was associated with depressive disorder [ 15 ]. Studies conducted among workers [ 16 ] and freshmen [ 17 ] in Japan showed similar associations between late bedtime and depressive symptoms. Third, sex differences exist in sleep quality, duration, latency, and architecture in the general population [ 18 ]; however, the impact of sex differences in relation to sleep, fish consumption, and depression in the Korean population is not well-understood.…”

“…A study of almost 16,000 adolescents found an association between earlier parental set bedtime and depression [ 25 ]. Epidemiological studies conducted in Japan reported that late bedtime predicted depression in workers [ 16 ] and university students [ 17 ]. Consistent with those studies, our study found that those who had late bedtime habits were also at a higher risk of having depressive symptoms.…”

Sleep Deprivation and Late Bedtime Impair Sperm Health Through Increasing Antisperm Antibody Production: A Prospective Study of 981 Healthy Men

“…Frequent shifts in sleep timing were associated with metabolic problems and increased prevalence of depressive symptoms [18,19]. However, the literature on effects of bedtime on sperm health is scant.…”

Healthy lifestyle habits benefit remission of recurrent aphthous stomatitis and RAS type ulceration

“…However, patients with depression might not think that they have had adequate sleep, so the association between the two is not completely clear. 10 In summation, some lifestyle habits seem to be associated with RAS or RAS-type ulceration as well as mental health. Although it is the commonest oral mucosal disease, the aetiology of RAS remains undefined.…”