There are many reasons for back pain while sleeping, such as overwork, too much sleep, arthritis, spondylitis, fasciitis and so on. 1. Overexertion: Due to excessive physical exercise and fatigue, it is possible to strain the ligaments of the back muscles, resulting in back pain while sleeping. 2. Too much sleep: too much sleep and a long-term position can also lead to back pain while sleeping. 3. Arthritis: Rheumatoid arthritis, rheumatoid arthritis, etc. may also cause back pain while sleeping, mostly accompanied by morning stiffness and joint swelling. 4. Spondylitis: For example, ankylosing spondylitis may also cause back pain while sleeping, and most of them are accompanied by spinal ankylosis, fever, and fatigue. 5. Fasciitis: Aseptic inflammation of the fascia of the back can also lead to back pain while sleeping. There may be other causes of back pain while sleeping, such as ureteral stones and herpes zoster and other diseases, which need to go to the hospital in time to confirm the diagnosis.