[PianoMan]

Always get your good night's sleep on your belly, with your feet hanging over the end of the bed and your head turned to the left.

If you're a belly sleeper, consider putting a nice thick pillow under your torso. It's easier on the neck, actually a quite nice way to sleep anatomically speaking. Sleeping on the side, it's often comfortable to have a thin pillow between the knees and arms/elbows. (I know this stuff from a training in some bodywork.) That's how I usually sack out, although I almost always wake up on my back.

[Skywalk]

Although I don't do it anymore, I actually used to sleep sometimes on my back with my one foot on the mattress and the other leg half-crossed over it. Yes it was an odd sight, but comfortable.

Something I also used to do quite regularly was keep a pillow between my knees and sleep on my side.