Drinking a glass of milk, especially a glass of warm milk, before bedtime is an age-old treatment for sleeping troubles. Some scientists believe it's the presence of tryptophan, a chemical that helps the brain ease into sleep mode, that does the trick. Whatever the reason, milk seems to help some people hit the sack more easily. And warm milk seems to be more effective at relaxing body and mind. However, if you wake frequently to urinate, avoid liquids for a few hours before bedtime. Other foods high on the tryptophan scale are cottage cheese, cashews, chicken, turkey, soybeans, and tuna.