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By Rick Nauert PhD Senior News Editor
Reviewed by John M. Grohol, Psy.D. on August 11, 2010


New research adds to the growing evidence that inadequate sleep can harm both the body and the mind.


Researchers at the University of Wisconsin-Madison have found that five nights of restricted sleep–four hours a night–affect the brain in a way similar to that seen after acute total sleep deprivation.


Although the new study was based on rats, researchers say the findings add to earlier studies suggesting the negative effects of restricted sleep for both the brain and the body.


The study appears in the current online edition of the Proceedings of the National Academy of Sciences.


“There’s a huge amount of interest in sleep restriction in the field today,” says Dr. Chiara Cirelli, associate professor of psychiatry at the School of Medicine and Public Health, who led the research.


Many people are sleep restricted, either because they have to or because they choose to be, she says.


“Instead of going to bed when they are tired, like they should, people watch TV and want to have an active social life,” she says. “People count on catching up on their sleep on the weekends, but it may not be enough.”


This “casual” lack of sleep can be harmful.


“Even relatively mild sleep restriction for several nights can affect an individual’s ability to perform cognitive tasks,” Cirelli says.


“For instance, recent studies in humans have shown that 5 days with only 4 hours of sleep/night result in cumulative deficits in vigilance and cognition, and these deficits do not fully recover after one night of sleep, even if 10 hours in bed are allowed. Sleep restriction can also increase resistance to insulin, leading to a risk of diabetes.”


Read in Full:  http://psychcentral.com/news/2010/08/11/cumulative-sleep-deprivation-harms-brain-and-body/16682.html



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