There is an interesting blog post at the New York Times about lack of sleep and weight gain.
Lost Sleep Can Lead to Weight Gain
This isn't terribly surprising, as you naturally eat less when you spend more time sleeping, and your body recovers better from stress when you get sufficient sleep. Insufficient sleep = insufficient recovery from stress = more release of cortisol (a stress hormone) into your body. This causes more retention of body fat.
The short take away is that sleep is important and you need to get enough of it. This article and the study it looks at just points more towards the value of sleep.
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