vraiment intéressant: http://rawlivingfoods.typepad.com/1/2009/06/more_sleep_for_.html
* Less than four hours of sleep per night increases obesity risk by 73 percent, compared to subjects who slept seven to nine hours each night
* An average of five hours of sleep per night increases obesity risk by 50 percent
* An average of six hours of sleep per night increases obesity risk by 23 percent
The researchers believe that body chemistry might explain the link between sleep deprivation and obesity. A lack of sleep increases grehlin, a hormone that sends a hunger signal to the brain. At the same time, the level of a protein called leptin drops. Leptin helps suppress appetite, so when the level is low, appetite increases. Combine too much grehlin and too little leptin, and you've set the stage for an intake of too many calories.