How can I tell him to not sleep over?

My boyfriend and I have been together about a year and a half and he ALWAYS spends the night at my apartment. He lives with his parents to save money, and he has more family who live there, so it's kind of crazy. He does a lot of nice things to me and I'm glad he wants to spend so much of his time together, but honestly I want my bed to myself sometimes! Just a few nights a week would be great.

I realize that he wants to get away from the craziness, but I wouldn't mind going over there sometimes either. I like his family a lot and we get along. I've mentioned this to him before and he doesn't take me seriously, and I don't want to hurt his feelings. Is there a way to make this request without causing a big fight?