I think mine sleep and/or munch their dry food throughout the night. Sometimes they come into my room for a nap with me.

I have to tell you about my brother's cat Max. Max spends the night trying to open cupboard doors and also those folding doors. My brother said he will wake up and hear the tap-tap-tap of the cupboard door. He has found Max inside the cupboards on occasion. There is nothing that he really wants in the cupboard, he is just bored I guess. I keep telling my brother he needs to get Max a brother or a sister. He says no, he is a one cat kind of a guy.