There's a hypothetical witching hour for dieters - sometime in the evening is when most "experts" say you shouldn't put anything else in your mouth until morning. But if you're famished after dinner, should you really starve yourself? {relatedarticles}Nope. In fact, the right midnight snack can keep you from overeating and help you sleep better. But before you raid the fridge, it's important to figure out if you're hungry or thirsty. Drink a cup or two of water before you munch, and you may find that it's easy to get to sleep. If you still feel hungry after a drink and can't sleep, then try a starchy snack, like potatoes or rice. They elevate levels of tryptophan, an amino acid, in the blood and can help you have more restful sleep.