An important factor that can influence individual preferences for mattresses, beds and sleeping positions is the specific back condition a person has. For example:
In general, elevating the knees slightly by placing a pillow under them while lying on the back can help many general forms of low back pain. Many patients also find that this is the most comfortable way to sleep after spine surgery.
Sleeping in a reclining chair, or an adjustable bed that allows one to put the head and knees up (the semi-Fowler position), can also help people with lower back pain sleep better. Specifically, patients who suffer from conditions in which the pain feels worse when standing up straight and better when bending forward may benefit from a reclining chair or adjustable bed.