What reason is the severe backache when sleeping

When sleeping, the back pain is severe, generally there are several reasons. First, lumbar muscle strain, lumbar spine on both sides of the psoas muscle distribution, when a long time of chronic muscle fatigue, such as long-term bending or sedentary, will show the chronic strain of the lumbar muscle, then will sleep at night when the back pain. Second, the back myofascitis, myofascitis is a layer of fascia tissue covered by muscle surface, when cold or strain will show the aseptic inflammation of fascia, but also in sleep when the back pain is very severe. Third, lumbar spondylolisthesis, lumbar spondylolisthesis is more common in congenital lumbar dysplasia, cheek fissure, will show the dislocation between the two lumbar vertebrae, in sleep when a certain posture or turn over when the back pain is very severe.