Can i block my roommates xbox from the wireless network?

one of my roommates has been pissing the rest of us off with his constant xbox playing. he leaves the lights and tv and shit on all night and refuses to turn the volume down. in addition to being extremely annoying, our electric bill has gone from the low 80s to upper 90s since he started playing. Is there a way to block the xbox from using the wireless router? as of now, we have just been uplugging it and plugging it back in so when he comes to to check the internet it says its working.