Welcome to the reason I got interested in hammocks. I pitched the tent in what seemed to be a flat spot and woke up in one end, bundled up in a ball, the thermarest over there and my head resting in the side of the tent.

Now I'm a hammocker because I can sleep so much more comfortably than I used to - pad never kept my hip from hurting, but that's not a prob any longer.

What has been suggested, silicone sealer on the pad, will help with thermarest slippage. But I wonder if it will keep you from sliding off the pad.