LOTS OF DIETERS FAIL because of the second-to-last thing they do before going to bed: search the cupboards for something crunchy or sweet - and then down it while watching their favorite late night program. The way to combat the urge: Pick what you're going to have for your final meal of the day - and stick to it. Saint Louis University scientists found that nighttime bingers who ate a predetermined snack 90 min after dinner were able to shed 5 pounds in 2 months. Eating a fixed snack prevents overeating. You can have the same snack used in the study - 3/4 cup fiber-rich cereal with 2/3 cup low-fat milk.