Futon: RUN AWAY! I slept on a Futon for about 6 weeks in Australia and it was uncomfortable as HE-double hockey sticks. Seriously. My back was not the same for about 4 months after.
Loft Bed: Kinda freaks me out. Don't know if I would like to be up that high.
Day Bed: Slept on one when I lived in Cow-town. It was good.
Threaded Mode