Eating big portion during dinnertime, having dinner after 8 PM, staying up late, having too much desert may be risk factors in weight gain.  A recent study from Northwestern Medicine found that late sleepers consumed 248 more calories a day, mainly at dinner and later in the evening. They ate half as many fruits and vegetables, twice the fast food and drank more full-calorie sodas than those with earlier sleep times. The extra daily calories can mean a significant amount of weight gain – two pounds per month – if they are not balanced by more exercise.