You need to find a way to sleep with your head and neck straight. You need to find a mattress and pillow combination that allows you to feel like you are almost floating with minimal sensation. Everybody is different. We all need to find our own system. We can't expect someone else to fix this without our effort.

Side sleepers can use a horseshoe pillow. I saw one on Groupon last week.

Those posture pillows are worthless to me. I need NO lift, just side support so my head does not roll to the side.

I learned to sleep on my back by first sleeping in a recliner chair. An adjustable bed may help.

When I sleep in a good posture, I wake up refreshed. If not, I have a lousy day.