What am I doing wrong??

I eat very healthy during the day but in the middle of the night, I get up and eat something sweet (grahm crackers, etc. & milk). I am actually shaking and feel sick until I eat them. Here is my typical daily diet:

Breakfast @ 8am:
Old fashioned oatmeal with honey and lofat milk
natural unsweetened apple juice
coffee w/splenda

Snack @ 10 am:
prunes

Lunch @ noon:
Tuna on a low carb whole wheat wrap with spinach and avocado
Water

Snack @ 2pm:
celery sticks w/hoummus

Dinner @ 5pm:
grilled skinless/boneless chicken breast
green salad w/spinach and tomatoes w/red wine vinegar
steamed zucchini
hoummus

Snack @ 7pm:
healthy choice popcorn 100 calorie bag
lofat hot chocolate

I think this is a good diet. I don't understand why I'm having these cravings in the middle of the night. I don't have any sweet cravings during the day???