Solution:

Heather, since becoming an RA here at the University of Utah, I have had to learn how to help people deal with impossible roommates. One of the first things I would suggest is sit down with the person and explain your concerns. Try writing out a roommate contract. A few sample concerns to have on your contract would be: garbage (who will take it out? What kind of schedule will you create?), bathroom (who cleans what and how often), "most nights I like to go to sleep by _______", guest "procedures", emotional style (do you enjoy being alone? Moods? "How will I know when you're upset?"), etc. If the conract doesn't go over well, you could always find a person to act as a mediator and set up a time when you and your roommate can both meet with the person at the same time. It is wise to not alow the mediator to be a friend (unless they are a friend to both you and your roommate and they show no bias to either party). If that doesn't work, one of you will most likely have to find a new place to live. Not sure if this is helpful, but hey, thought I'd give it a try. Best of luck and if you need anymore help, let me know.