What should I have for a snack?!?

Don't know how late at night it is where you are, but if you'll be going to bed soon and not doing anything active, I'd definitely stick with protein snacks and avoid any carbs. Hard-boiled eggs are good, so is a cheese wedge or some beef jerky.

You've only had a little over 800 calories if you want more nut butter with fruit or bread I don't think that would be a problem.

Wow - your diet is so healthy any suggestion I have may not be your thing. The eating at night thing is a myth and has been scientifically proven so we have that out of the way. Now, I try to have good snacks but as long as I can work it into my remaining calories, I sometimes just have what I want but not often. I try to hit the protein hard in snacks because I am not a big meat eater. I love the Chobani Greek Yogurt. You can get the fat free and it is really as good as the 2% to me. I always keep some bananas in the freezer. So, sometimes I will make a smoothie with 8 oz of milk, cut in chunks the frozen banana and 4 pecan halves and blend it all together. It gives me the illusion of a banana shake with slivers of nuts. You can use any frozen fruit to do this. You sure have a lot of calories left. Are you sure you are eating enough?

You need to eat more calories today. Even when you want to eat less than the suggested, you should still aim for at least 1200. I think you should eat what you want - protein would be good. But, you might want to think about some healthy snacks to have on hand in case this happens again. I've been making homemade granola bars - only about 125 calories each and very filling.

What is your goal? Are you trying to lose weight or maintain?

An awesome snack I tried this week was take two Carmel rice cakes, mix sugar free whip cream with a few dashed if cinnamon. Put about three or four Tablespoons on one cake and top it with the other rice cake. Pop in the freezer for an hour. It's like an ice cream sandwich.

Don't know how late at night it is where you are, but if you'll be going to bed soon and not doing anything active, I'd definitely stick with protein snacks and avoid any carbs. Hard-boiled eggs are good, so is a cheese wedge or some beef jerky.

I live in California, it's 7:35pm and I usually don't go to sleep until 11pm! Is it bad to eat carbs at night?

nope not bad to eat carbs at night

Yes, it is. How bad depends on your metabolism & how quickly your particular body uses carbs. But remember, carbs are designed to fuel your body when it's active: they provide quick bursts of energy. If you eat them and then just sit around, or go to bed, they will just get stored on your body as fat.
Protein, on the other hand, digests more slowly and is burned more slowly. So if what you need is something to satisfy the munchies, something that will provide steady, slow-burning energy for inactive times, you should eat protein. It's more likely to get used & not stored.