Is a guy interested if he asks me to sleep over?

I was at my college orientation and was hanging out in a dorm room with 2 guys and another girl.. I mentioned that I didn't know where i was gonna sleep because my roommate was really suspicious and weird and I didn't want to stay with her. One of the guys asked if I wanted to sleep in their dorm room, with a totally straight face. Was he just being a guy and messing around or do you think he's interested? Or just being nice maybe?