No such thing as healthy late night eating.
Your body commits too much blood to your digestive region to get a good night's sleep and it takes away from other vital functions like your immune system. Best thing is to not eat anything 4 hours before you go to bed. If you have the serious munchies then go for something light and easy to digest like non-fiber and non-meat stuff.
If you're working out then DEFINETLY DON'T EAT ANYTHING!