Midnight snack ideas?

Apparently, DD9 has a pint size stomache because she keeps crawling out of bed at 8:30pm, saying that she is hungry. Maybe, she is growing? My kids always have fresh water in their rooms in case they get thirsty at night, however, I am worried about tooth decay if I allow snacks. Are there any "tooth friendly" midnight snacks? I have been giving her cream cheese cracker sandwiches but those need refrigeration so that she wouldn't be able to keep them in her room...