Had a friend back when we lived in Montana, he came out to be with us as we elk hunted and camped in the West Fork. Told him not to bring an air mattress and that is exactly what he brought. I told him he will freeze on that thing at night and the first night I woke up in the middle of the night and his teeth were chattering. I went out and got some hay that we had for the horses and told him to throw that mattress away and put his sleeping bag on the hay. It was funny but I felt sorry for him freezing on that darn air mattress.