I always need to have a "knee pillow" that goes between my knees or I can't sleep. I usually sleep on my left side, since laying on your left side aids in digestion (how your stomach drains, etc.).

And I try and turn away from my bed/blanket hogging boyfriend to protect my space and blankets!

I sleep on my side with a pillow between my legs.

On my side with top leg bent and bottom leg straight.

On my side usually.

On my side, facing the door, curled up in the smallest ball possible.