To me there is something deeply comforting about inertness. I hate the springyness in matresses so much I got a natural latex mattress, which I found out most people get because of allergies, but to me its like a kinetic sensory deprivation chamber- just absorbs all movement and doesn’t reflect it back.

Okay, and the sensory deprivation helps you sleep? I suppose that's generally what we're headed for. Turn off the lights. Set the temp to a certain level.

The hard ground isn't giving either, but you feel it. ;)

I also can't deal with pillows when I have a migraine. Though I can't sleep without something under my head. I usually just roll up a towel or something. As I said before, I think it's about having precise control over body position.