Double shifts disrupt normal cortisol patterns
Working double shifts is associated with alterations in normal cortisol patterns, according to a study published online April 8 in Nursing Open.
11 hours ago
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Physiological Phenomena: News and Research on Circadian Rhythm
MeSH tree: G07.180.562.190
Sleep deprivation disrupts gut microbiota, worsening colorectal cancer outcomes
Sleep deprivation has long been known to weaken the immune system. Now UF Health Cancer Institute researchers have made a startling discovery: The gut microbiota drives changes to the immune system caused by chronic sleep ...
15 hours ago
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Baby's body clock begins to synchronize with local time while still in utero, study shows
Humans and most other organisms have internal biological clocks that track the daily cycle of sunrise and sunset. These clocks help time our sleep, metabolism and other essential body functions over the course of a day, creating ...
Apr 10, 2026
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The body's internal clock can be determined from a hair sample
A research team at Charité–Universitätsmedizin Berlin has developed a test that can determine a person's chronotype based on their hair roots. It is intended to lay the foundation for circadian medicine—that is, medicine ...
Apr 1, 2026
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How shift workers' internal clock affects their health
Health care workers who take on extended or overnight shifts, particularly during periods of operational strain, may face heightened fatigue that can affect their own well-being. This fatigue arises not from individual effort ...
Mar 26, 2026
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Is lighter sleep a normal part of aging, or a sign of something more serious?
As you get older, it's normal to notice changes in your sleep. These can include fewer hours of shuteye, waking up more during the night, and finding it harder to drop off. However, despite the general view that older people ...
Mar 24, 2026
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Nearly half of U.S. kids lack adequate sleep, survey shows
Nearly half of all U.S. children aren't getting the sleep they need, a new National Sleep Foundation survey reports. About 44% of children do not consistently get the recommended amount of sleep for their age, according to ...
Mar 15, 2026
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Circadian rhythm drives metabolic dysfunction in fat cells, study finds
Northwestern Medicine scientists led by Joseph Bass, MD, Ph.D., the Charles F. Kettering Professor of Endocrinology and Metabolism and director of the Center for Diabetes and Metabolism, have discovered how disruptions in ...
Mar 9, 2026
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Study finds no seasonal spike in fatigue despite widespread 'spring tiredness'
When the days start to get longer again, Dr. Christine Blume's phone rings more often. That's because journalists want to ask the sleep researcher what spring fatigue is all about.
Mar 9, 2026
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How springing forward to daylight saving time could affect your health
Most of America "springs forward" Sunday for daylight saving time. Losing that hour of sleep can do more than leave you tired and cranky the next day; it also could harm your health.
Mar 7, 2026
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