From The Telegraph: Shortage of sleep is linked to obesity.
The less you sleep the more your waist will expand, say scientists who have linked the insomniac lifestyle of western society to the epidemic of obesity.
Lack of sleep boosts levels of a hormone that triggers appetite and lowers levels of a hormone that tells your body it is full, according to the team. The scientists will now study whether obese people should sleep more to lose weight. [continue].
Related:
Studies Show Why Lost Sleep Equals Gained Weight - Reuters