Circadian rhythms orchestrate a vast number of life's processes through the activity of a 24-hour internal clock: hormone flow, blood pressure, sleep and wake cycles, and even the timing of hibernation among marmots and bears, ...
Research led by Peking University, China, has discovered a single type of retinal photoreceptor cell in Drosophila (fruit fly) is involved in both visual perception and circadian photoentrainment by co-releasing histamine ...
A study led by the Department of Cardiovascular Medicine, Center for Circadian Metabolism and Cardiovascular Disease, Southwest Hospital, Army Medical University, China, looked into how meal timing regulates exercise capacity ...
Think sleeping in on the weekend can repair the damage from a week of sleepless nights?
Feb 28, 2019
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Three Americans won a Nobel Prize on Monday for discovering key genetic "gears" of the body's 24-hour biological clock, the mechanism best known for causing jet lag when it falls out of sync.
Oct 2, 2017
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Oxford University researchers have discovered what causes a switch to flip in our brains and wake us up. The discovery, published in the journal Nature, brings us closer to understanding the mystery of sleep.
Aug 3, 2016
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A handful of large studies of cancer risk factors have found that working the night shift, as nearly 15 percent of Americans do, boosts the chances of developing cancer. MIT biologists have now found a link that may explain ...
Jul 29, 2016
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If you pull an all-nighter or stay up late to binge watch Game of Thrones, you will probably be grumpy the next day. But if you don't get enough sleep for weeks or months on end, you may develop depression or other lasting ...
Feb 22, 2016
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(Medical Xpress)—Shift work sleep disorder comprises a group of symptoms including insomnia, proneness to accidents and inattentiveness that typically afflict people whose work schedules shift between day and night, disrupting ...
(Medical Xpress)—Researchers at the University of Surrey in the U.K. have found that drastically altered sleep schedules (such as switching to working a night shift) can dramatically impact gene expression rhythm. In their ...
A circadian rhythm is a roughly-24-hour cycle in the biochemical, physiological or behavioral processes of living entities, including plants, animals, fungi and cyanobacteria (see bacterial circadian rhythms). The term "circadian", coined by Franz Halberg, comes from the Latin circa, "around," and diem or dies, "day", meaning literally "approximately one day." The formal study of biological temporal rhythms such as daily, tidal, weekly, seasonal, and annual rhythms, is called chronobiology.
Circadian rhythms are endogenously generated, and can be entrained by external cues, called Zeitgebers, the primary one of which is daylight. These rhythms allow organisms to anticipate and prepare for precise and regular environmental changes.
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