I'd like to call a bed as well for the reason Jeremy stated, as well as generally having a terrible time getting to sleep in unfamiliar places. It's pretty common for me to take 2-3 hours to fall asleep under 'sub-optimal' conditions, no matter how tired I am.
If I have to share a bed with someone though, I think I'll stick to the floor. Not that I'm afraid of being near any of you, it would just be really weird since I never sleep like that.