The term social jetlag is used to describe the discrepancy between biological time,
determined by our internal body clock, and social times, mainly dictated by social obligations …

Attention is a cognitive process crucial for human performance. It has four components: tonic
alertness, phasic alertness, selective attention, and sustained attention. All the components …

The onset of melatonin secretion, the dim light melatonin onset (DLMO), is a tool for
determining the phase of the circadian timing system. Although small studies have …

Circadian clocks drive cyclic variations in many aspects of physiology, but some daily
variations are evoked by periodic changes in the environment or sleep–wake state and …

Individuals vary in how their circadian system synchronizes with the cyclic environment
(zeitgeber). Assessing these differences in “phase of entrainment”—often referred to as …

In the absence of electric light, sleep for humans typically starts soon after dusk and at
higher latitudes daily sleep timing changes seasonally as photoperiod changes. However …

Background Timing drug administration to endogenous circadian rhythms may enhance
treatment efficacy. In the Chronotype sub-study of the Treatment in Morning versus Evening …

Physiological function fluctuates across 24 h due to ongoing daily patterns of behaviors and
environmental changes, including the sleep/wake, rest/activity, light/dark, and daily …

Chronotype is a reliable biomarker for studying the influence of external zeitgebers on
circadian entrainment. Assessment of chronotype variation in participants exposed to …

Current dietary trends show that humans consume up to 40% of their energy intake during
the night. Those who habitually eat during the night are observed to have an increased risk …