Hi, I am having back pain, but only at night. When I go to sleep, I usually feel fine. At night I often wake up with pain in my lower or middle back. In the morning or during the night I do some exercises that my doctor recommended, which seem to help. Once I get up in the morning and start moving around, I start to feel better. By mid-morning I usually feel fine. I have changed my mattress and tried sleeping on different beds, but I can't find anything that gives long term relief. What do you think?