The main cause of back pain when sleeping is inflammatory low back pain, the so-called inflammatory inflammation means inflammation of the muscles, tendons, fascia, ligaments, joint capsules and other soft tissues of the back, the most common of which is the fasciitis of the back and low back, fascia is the white tendons on the surface of the meat that you normally see, this is called fascia, fascia will become inflamed after cold, strain, trauma. Of course, this inflammation is aseptic inflammation, not purulent inflammation, after the exudation of aseptic inflammation, stimulation of nerve endings will be pain, sleep at night when the activity is reduced, the venous return is slower, inflammatory pain-causing substances in the local retention, so the pain increased.