Every once in a while I very much enjoy sleeping on the floor, especially if I have a back injury. I've heard there are numerous health benefits. Since I've never found any definitive information I've decided to run a little experiment. If things go well toward the end of the week I may extend the experiment. Night 1 Sleep Time: 5 hours Sleep surface: In a sleeping bag on yoga mat over carpet. Notes: Being primarily a side sleeper I had issues getting to sleep. Once asleep I usually change sides several times throughout the night. I woke up each time I did because of the hardness of the floor. I woke up feeling more rested than usual but a little sore in the shoulders. For Night 2 I plan to build a makeshift futon by folding my comforter and zipping it inside the sleeping bag.