If I stay up too late, sometimes I get hungry before going to bed. If it is just a little hungry and I am really tired, it doesn't keep me up at night so I don't eat anything. In that case, a drink of water or a cup of hot chamomile tea (calming and no caffeine) might be sufficient. But if I am really hungry, a tablespoon of peanut butter kills the hunger long enough for me to go to sleep. A tablespoon of peanut butter on celery sticks will also do the trick. This may put you over your calorie goal a little but that is better than hunger keeping you awake at night. The loss of sleep due to hunger keeping you awake is way more damaging than a few extra calories. If this happens to me more than once a week, I take a look at the number of carbs that I am eating for dinner. Too many carbs will cause you to be hungry sooner than the same number of calories consumed as protein and fat.