Sleeping on your stomach is the worst position for your neck. Sleeping on your side is better and sleeping on your beck is best. It is a learned behavior. When on your side, you need to use a pillow that does not let your head tip to the side. I bunch mine until it support my head properly.

I had to learn to sleep on my side because I have carpal tunnel syndrome. Sleeping on my side caused me to sleep on my wrist making it worse. Wearing splints to bed made sleeping on my back much easier because side sleeping was even less comfortable.

I do a lot of sleeping in a recliner. I often get my best sleep in a recliner, especially when I am struggling in bed.