Abstract Circadian (∼ 24-hour) timing systems pervade all kingdoms of life and temporally
optimize behavior and physiology in humans. Relatively recent changes to our …

A common feature of aging is the advance of the timing of sleep to earlier hours, 1–7 often
earlier than desired. 8–10 The sleep of older people is also characterized by an increased …

Light around twilight provides the primary entrainment signal for circadian rhythms. Here we
review the mechanisms and responses of the mouse and human circadian systems to light …

The circadian system in animals and humans, being near but not exactly 24 hours in cycle
length, must be reset on a daily basis to remain in synchrony with external environmental …

The field of “circadian medicine” is a recent addition to chronobiology and sleep research
efforts. It represents a logical step arising from the increasing insights into the circadian …

Exercise Psychology, Second Edition, addresses the psychological and biological
consequences of exercise and physical activity and their subsequent effects on mood and …

SINCE the first report in unicells1, studies across diverse species have demonstrated that
light is a powerful synchronizer which resets, in an intensity-dependent manner …

Circadian rhythms influence most of our life activities, notably getting up and going to sleep
every day. The new edition of this book delves into the mechanisms surrounding how these …

Background Vitamin D deficiency is common in older adults and has been implicated in
psychiatric and neurologic disorders. This study examined the relationship among vitamin D …

We investigated the impact of light exposure history on light sensitivity in humans, as
assessed by the magnitude of the suppression of melatonin secretion by nocturnal light. The …