There is growing evidence that short sleep duration is associated with future weight gain, especially for children. Susan Redline at Case Western has shown that teens getting 6-7 hours of sleep per day were 2.5 times more likely to be overweight than those getting eight or more hours of sleep. In another study, teens who slept less were 2.1 times more likely to consume 475 or more of their daily calories from snacks.
PositiveTip: Adequate sleep is vital to maintaining self-discipline over all choices, including calories.