How do I stay on top of the housework when I am working?

I am a nurse and have a very hard and stressful work week. I try hard not to just leave things lying around, but sometimes I am to tired to fold the laundry before I go to bed and so it sits there til morning. Also I live with someone that tends to be messy. Dirty clothes on the floor, office has papers all over the floor, doesn't like to do dishes. I am just one person and I only have so much time and energy to devout to cleaning and when I do that I don't have time to give to myself for rest and fun. How do we get the place clean and stay on top of it so it doesn't turn back into a pig sty. PLEASE HELP!!