air mattress

Hey All! I have an ALPS Mountaineering Lightweight Double Air Pad that is fantastic. It'll velcro together in the middle to make a roughly full size bed, or velcro over on it self to double the thickness for one person. But I'm having a problem staying on the pad when I'm sleeping. How do y'all...

For you tent campers out there I am curious as to what you use to get you and your companions off the ground. I have been using a Thermarest back packing mattress am am thinking of moving to a cot but before I do I would like to get some other opinions.