Crazy roommate watching TV?

My roommate is always watching TV when I wanna sleep. He's a very good guy, really, but somewhat crazy... I asked him several times to turn it off, but he simply ignored me. Then one day I simply turned it off with a hammer. It was quite showy, but provoked a furious quarrel. We were still roommates after that. The problem was solved for about a couple of months. But now it starts happening again and again. I wanna sleep, and he wanna watch some TV crap. I don't wanna use hammer again (quite expensive). How could I render that damned TV unusable so that he can't repair it but don't think I'm somehow involved into that "malfunction"? I wanna sleep! Help please.