Why are stink bugs attracted to my room?!?

I don't even leave my window open because I fear/hate bugs with a pion! However, every day I see another one in room! I have no food in it, it doesn't seem like my room has a scent to it (I asked if it did) and I heard that they were attracted to light, so I keep my room lights off, unless I really need them on at night, I do use them for a half hour at 6 am to get dressed. I just want to know what to do to prevent those ugly, flying, crawling bugs from entering my room! They are nowhere else in my frickin' house and I live with two other people!