I like to suffocate myself just enough to pass out. I sometimes attempt a barrel roll as I fall towards the bed, so I'll sleep in any position I happen to fall into the bed in. And regardless of where I sleep, I always wake up holding the gun under my pillow. Even if I'm crashing at a friends place and did not bring a gun.
Honestly, though, I have no constant. I share the bunk with the missus and our two dogs, so I'll sleep however I can. I also have the annoying habit of constantly changing my position before I am satisfied.