I toss and turn a lot. Usually sleeping on my sides, my back gets stiff if I'm still for too long. I think a breathing machine (CPAP or the inverse?) would hel

I toss and turn a lot. Usually sleeping on my sides, my back gets stiff if I'm still for too long. I think a breathing machine (CPAP or the inverse?) would help if not for my stiffness. I manage to go to sleep quickly... but also partially wake up regularly. Seven or eight interrupted hours is where I usually land