How about getting some low wattage night lights??? Although I really think everyone is right, he needs to be neutered.

My Munchkin, Shortie Girl, walks around the apartment meowing her head off after I go to bed. She's actually looking for MooShoo (personally, I think they're having a little "kitty love"). She hops up on my bed. Once I show her that he's right next to me under the covers with his head on the pillow, she settles down, curls up next to him and goes to sleep.

Hmmmmm, sounds like LOVE to me!!!