Daily rhythms in behavior and physiology are programmed by a hierarchical collection of
biological clocks located throughout the brain and body, known as the circadian system …

For the last two decades research has revealed an alarming association between short
sleep duration and metabolic disorders. In tandem, the hormonal, behavioral, and genetic …

Context: Shift work is a risk factor for diabetes. The separate effects of the endogenous
circadian system and circadian misalignment (ie, misalignment between the central …

Light at night (LAN) has been associated with negative health consequences and metabolic
risk factors. Little is known about the prevalence of LAN in older adults in the United States …

With the exception of high latitudes, life has evolved under bright days and dark nights. Most
organisms have developed endogenously driven circadian rhythms that are synchronized to …

Circadian clocks maintain periodicity in internal cycles of behavior, physiology, and
metabolism, enabling organisms to anticipate the 24-h rotation of the Earth. In mammals …

The increasing use of electric lights has modified the natural light environment dramatically,
posing novel challenges to both humans and wildlife. Indeed, several biomedical studies …

Objective Diet‐induced thermogenesis (DIT) is lower in the evening and at night than in the
morning. This may help explain why meal timing affects body weight regulation and why shift …

In association with sleep–wake and fasting–feeding cycles, organisms experience dramatic
oscillations in energetic demands and nutrient supply. It is therefore not surprising that …

Alternation between day and night is a predictable environmental fluctuation that organisms
use to time their activities. Since the invention of artificial lighting, this predictability has been …