Teens who slept less than eight hours on weeknights consumed 2.2 percent more calories from fats and 3 percent fewer calories from carbs than teens who slept eight hours or more, according to new research. In secondary analyses stratified by sex, the results were significant among girls but not boys. Also, for each one-hour increase in sleep duration, the odds of consuming a high amount of calories from snacks decreased by an average of 21 percent.