In humans, sleep regulation is tightly linked to social times that assign local time to events,
such as school, work, or meals. The impact of these social times, collectively—social time …

Study objectives Country or regional differences in sleep duration are well-known, but few
large-scale studies have specifically evaluated sleep variability, either across the work …

Delayed sleep–wake phase disorder (DSWPD) is a sleep disorder in which the habitual
sleep–wake timing is delayed, resulting in difficulty in falling asleep and waking up at the …

Social jetlag, a form of circadian misalignment, has been suggested to induce several
clinical symptoms such as mental/physical health problems. However, evidence on the …

Although sleep debt and social jetlag (SJL) influence daytime dysfunctions, the effects of
both sleep debt and SJL on them have not been analyzed. The aim of this study was to …

Although social jetlag (SJL) is generally considered a chronic condition, even acute SJL
may have unfavorable effects on the cardiovascular system. We focused on the acute effects …

Background Presenteeism is an indicator of productivity loss and the risk of absence from
work due to mental health problems. The purpose of this study was to determine the impact …

Background Circadian rhythm plays an important role as our internal body's clock that
synchronizes behavior and physiology according to the external 24-h light-dark cycle. Past …

This study aimed to investigate the associations between objectively measured sleep timing
and habitual dietary intake among university students. We hypothesized that a later …

Variability in the timing of daily sleep is increasingly recognized as an important factor in
sleep and general physical health. One potential driver of such daily variations in sleep …