Poorly.
I always wake up with a sore neck, head aches and I never ever feel well-rested, doesn't matter how early I go to bed.
As for position, how would I know? I can't see myself while I'm sleeping you know. Probably hugging my blanket as if there's someone with me. In the "hold me I'm lonely" way, not "sexy time" way.
I'm a sad bastard.