In England, after dinner, around 8-9 o'clock we have evening tea which consists of tea and cake or biscuits etc. To help some people go to sleep they will have milk and cookies (some elderly people will have an irish coffee (has whisky inside) to keep them warm and help them sleep), that is called a bedtime snack. If during your sleep you wake up and have the munchies, we call that a midnight snack. These are the terms as i know them from England. Not sure what other countries call them.

Midnight snack!

I agree with Norman. I think what Yi-ying is thinking of is "Supper" A "late night snack" or a "midnight snack" sounds more like just going to the fridge at night when you're hungry to find something to eat. I think that these are more solitary. Supper is more of a structured meal, that you would eat with other people, after dinner.

supper (noun) A light evening meal; served in early evening if dinner is at midday or served late in the evening at bedtime

Midnight snack! i agree this .