When I was a kid I would sleep walk frequently, usually just to the foot of my parents' bed and stand there creepily. I also had night terrors for a few years.
Now that I'm older, I have some really strange sleeping positions, but the oddest thing is that sometimes I will go to sleep inside the covers, in a certain position, and then wake up in the middle of the night in the same exact position except on top of the covers. And they are perfectly straightened like the bed has just been made. Usually I wake up from feeling cold, and then I feel confused and freaked out about how I ended up on top of my blankets in the same position, especially since I am a very light sleeper now and even just the cat silently walking into my room wakes me up.