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WSU researchers discover key mechanism behind sleep
Date:9/14/2010

SPOKANE, Wash. Washington State University researchers have discovered the mechanism by which the brain switches from a wakeful to a sleeping state. The finding clears the way for a suite of discoveries, from sleeping aids to treatments for stroke and other brain injuries.

"We know that brain activity is linked to sleep, but we've never known how," said James Krueger, WSU neuroscientist and lead author of a paper in the latest Journal of Applied Physiology. "This gives us a mechanism to link brain activity to sleep. This has not been done before."

The mechanisma cascade of chemical transmitters and proteinsopens the door to a more detailed understanding of the sleep process and possible targets for drugs and therapies aimed at the costly, debilitating and dangerous problems of fatigue and sleeplessness. Sleep disorders affect between 50 and 70 million Americans, according to the Institute of Medicine of the National Academies. The Institute also estimates the lost productivity and mishaps of fatigue cost businesses roughly $150 billion, while motor vehicle accidents involving tired drivers cost at least $48 billion a year.

The finding is one of the most significant in Krueger's 36-year career, which has focused on some of the most fundamental questions about sleep.

Even before the dawn of science, people have known that wakeful activity, from working to thinking to worrying, affects the sleep that follows. Research has also shown that, when an animal is active and awake, regulatory substances build up in the brain that induce sleep.

"But no one ever asked before: What is it in wakefulness that is driving these sleep regulatory substances?" said Krueger. "No one ever asked what it is that's initiating these sleep mechanisms. People have simply not asked the question."

The researchers documented how ATP (adenosine triphosphate), the fundamental energy currency of cells, is released by active brain c
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Contact: James Krueger
krueger@vetmed.wsu.edu
509-358-7808
Washington State University
Source:Eurekalert  

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