I'm assuming you had a snack/dessert after dinner. Because I find that I need a little something around 9ish to keep me from biting my nails until midnight. Sometimes when I really want to eat and it's late, I go to bed early. It's better than consuming extra calories I don't need. I usually wake up bright and early.
The only motivation I can give you is to keep your goal in sight. Think of a cute outfit you want to wear this summer. Try to remember that in July when you're wearing it you won't have missed a few cookies you could have eating in March.