“In a study of 15 healthy men, researchers found that a couple nights of grabbing only four hours of sleep caused the men to curtail their physical activity compared with days where they had gotten the standard eight hours the night before. In contrast, there was no evidence that sleep loss altered blood levels of appetite-regulating hormones or caused the men to eat more the next day -- effects that have been seen in a number of previous studies...
http://www.reuters.com/article/idUSTRE60331020100104
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