Taken from a participant's sign-up form for a study (on room ventilation, no less):

What is your most preferred sleeping posture?

The names are so descriptive: freefaller, starfish...haha. So, what's your favourite posture?

Warning: unlike in the study, responses here have no guarantee of privacy. I can only guarantee that I won't yell "you sleep like a starfish!" the next time I see you...as that would probably embarass me more than it would you. Answer at your own risk.