Such an old article, but it's one of the contributing factors to obesity.

It's not just eating junk food that effects your weight, it's the number of hours of sleep that counts as well. Because less sleep tends to increase your appetite and with the food just within our reach, it's no wonder it's easy to get fat in America. The reason why as Dr. Taheri said is that when you sleep less, you produce less leptin, a hormone that helps reducing your appetite. Sure, a good rest everyday does take up more thirty percent of your day, but in return you're energized, you brain functions just fine, and you're appetite should be at normal level.



P.S. I think I heard somewhere a long while ago that if you choose to sleep less, you're bound to eat 25% more than you usually do.