I usually fall sleep on my side...or stomach...or back...ok so I really dont have a preference, depends on how tired my body is...and how I feel like I need to relax - and please tell me what a duvet is
nevermind, I looked it up. and umm, it always depends on how hott I am...I have more of a tendancy to sleep with the covers up to my chin

just because but sometimes I sleep on top of the covers cause its hott