What if someone sleeps naked in my dormitory? I can't stand it, every day. How to talk to him?

Your purpose is to solve the problem of his naked sleep, not to break up with him, so I suggest that when you talk to him, you must pay attention to one degree: never use insulting words that damage his dignity.

You can tell him frankly, if he is a straightforward person; You can also take a tactful and subtle way to remind him very politely.

Of course, if you are willing to spend a few dollars, you might as well give him a pair of underwear.