When you sleep on your side, what do you do with your arms?

I know, silly question but apparently, since I have been sleeping on my left side, I have spent many a night slapping my husband in the face with my hands. I guess I'm sleeping with my arms straight out and if he gets too close, whammo! Ooops. (it is kind of funny, though...)

What do you do with your arms when you sleep on your side?