Either side is fine, but my left hand side is currently preferred as it's the side where I'm facing away from the window.

I also enjoy sleeping on my back, but not the accompanying physical abuse in the night and verbal abuse in the morning I receive. I snore if I sleep on my back, see.

I will turn throughout the night, but I never go to sleepisode or wake up on my front. I can deal with a sort of angled side-sleep where you're half on your front but the arms are still on the same side. Arms on either side, face down? No chance.