Hi Mikerlay,
Dreams are dreamt to respond to what happens during the sleep.
My guess is that you have a chronic pain come on during sleep that is brought on by sleeping in a certain sleeping position.
I ssume you're implying that sometimes your "soul" seems to walk away from you.
This usually happens when a sleeper moves from the usual bad sleeping position to a more comfortable one.
Were someone watching you during these dreams, he/she would notice you actually change sleeping positio: turn over, stretch, or curl up.
Everybody dreams in a personal, individual way and your dreams are quite normal.