[Klaustrophobia]

sounds REALLY easy to push around to me.

[Enigmatic Entity]

Left, mostly, sometimes right. On back = stay awake, as for on stomach...

If I can't get to sleep: "I toss and turn like a spineless dirtbag cat in a tumble drier."

Could be because I always used to sit in the seat on the left side of the car when I was younger? Now I sit in the driver's seat 

[Wobble73]

I spoon the wife!   

So it depends if she's on my left or my right. 

[T-LoW]

Alone:

Sleeping on my belly. Sometimes on my left or right. Never on my back (only if I get forced to do that... anyway...). But mostly on the belly

My blanket is often turned upside down the next morning - god knows why.