This article was about the relationship between lack of sleep and weight gain. Studies show that adults and children are more likely to be overweight and obese if they sleep less at night. Researchers conducted smaller studies that showed losing just a few hours of sleep per night added on average an extra two pounds. Studies also showed that the more sleepy you are, the more likely you are to crave calorie rich junk food.

http://well.blogs.nytimes.com/2013/08/06/how-sleep-loss-adds-to-weight-gain/?_r=0