i'm a side sleeper
When I am on my back, my head is to my left of centerline. Mostly, though, I do some flopping around and my normal position is with my knees slightly drawn up sleeping on my side. The bottom opening (closed) runs across my shins and supports my legs and my wrap-around inflatable pillow keeps my head in line with my body.
I have a Nunatak Arc Alpinist quilt, so when I assume the side-laying position, I can still keep my feet in the footbox and the quilt lays nicely on top.
Funny Money-- I saw what you did there!
Keep close to Nature's heart... and break clear away, once in awhile, and climb a mountain or spend a week in the woods. Wash your spirit clean.
- John Muir