Gosh, I haven't even thought of that.
Lets see, I go to sleep usually on my back and I will sometimes roll onto my left side. Unfortunately, the right side of my neck and my right shoulder (not exactly the shoulder joint but somewhere between neck and shoulder) is pretty well affected by AS.
I have too much pain when I lie on the right, which has always been my favorite position.... (for SLEEP!)
But I usually do change positions if I wake up.
I will try to notice what my position is when I'm doing the dreaming.
That's interesting, maybe others will let us know if this has any impact on the dream.
Darla