Sleeping through the night with back pain, the specific reasons are as follows: First, the bed is not suitable: sleeping on a very soft bed will cause the back muscles to be at a higher tension, the back muscles can not relax, this will cause muscle strain, so there will be a back pain when you wake up. Second, ankylosing spondylitis: the typical symptom is that at night there will be back pain, lumbar pain, in the morning when you get up, by properly moving the joints of the low back, this pain will disappear and the stiffness will be relieved. Third, the patient is too thin: sleeping on a very hard board bed will cause the bony protrusions of the back and the bed surface to come into contact with each other and be pressed, thus causing pain to occur at the multi-point bony protrusions of the back.