Housemate venting

So I have some new housemates now. One of them seems to have some serious issues regarding respecting other people's space. I recently discovered that he's been hanging out in my bedroom when I'm not around. Actually, it seems he used to only do it when I wasn't around, but lately I've come home to find him sleeping in my bed! Yes, I know it's more comfortable than his room, but you might think fixing up his own space might be the more proper course of action. The worst part is that he doesn't even bother making sure the bed is made, so he's right on the sheets. His grooming isn't what it could be so he drags an assortment of bits of cruft into the bed with him. I started closing my door, but unless it's well-latched, he just goes in anyway. I've tried discussing the issue with him, but it's like he doesn't understand a word I say. Hmph. Lucky for him he's so cute & fuzzy.