Sleeping with back pain and waking up without pain may be caused by lumbar muscle strain, lumbar disc herniation, and ankylosing spondylitis. 1. Lumbar muscle strain: long-term lumbar muscle strain caused by excessive strain on the lumbar region, during the day at work activities may not be obvious symptoms, sleep nerves and muscles are in a state of relaxation leading to obvious pain. 2. Lumbar disc herniation: mostly considered to be due to incorrect sleeping posture or mattress soft and hard inappropriate, the spine can not get effective support, lumbar vertebrae physiological bending changes, resulting in sleeping nerve root pressure increased, appearing in the performance of the lumbar pain when sleeping, and get up due to activities and posture changes, lumbar disc load reduction, the symptom has been relieved to a certain extent. 3. Ankylosing spondylitis: ankylosing spondylitis can have lumbosacral pain, activity limitation, morning stiffness and other symptoms, there can be sleeping lumbar pain to get up on the pain of the symptoms. There are other causes of back pain in bed to get up without pain, if the persistence of non-relief, it is recommended that timely medical care, improve the examination to clarify the cause of the disease, follow the doctor’s instructions for targeted treatment, so as to avoid delays in the condition.