With my PD my pulmonologist recommended raising the top of my bed. I didn't want to get a wedge pillow with a steep slope, which many people with PDs use, because I thought it would hurt my neck or back. I got a 7" foam mattress riser from Avana that I actually put on top of my mattress and cover with a 2" foam mattress topper. The Avana riser raises the top of my bed 7 inches and tapers with a gentle slope to the foot of the bed and doesn't hurt my neck or back. Have you had a sleep study test to see if you have sleep apnea? Many people with PDs do have it; and their sleep has been dramatically improved by using a bipap machine, with or without oxygen. My sleep apnea was diagnosed before my PD was, and my CPAP continues to be all I need to get a good night's sleep. There doesn't seem to be a consensus among the people on the facebook page for people with paralyzed diaphragms on optimum positions, ie stomach, back, PD side, nonPD side. Many people with PDs have bought adjustable beds, which have helped them immensely. I bought my Avana riser from the company website, but you can find them elsewhere. Good luck! https://www.avanacomfort.com/mattress-elevator.html