Sleeping waist is suspended may be a normal physiological phenomenon, may also be the emergence of anterior pelvic tilt and other pathological phenomena. 1. Physiological phenomenon: under normal circumstances, sleeping waist is suspended state, because the human spine will have a certain curvature, as long as there is no pain or discomfort state is generally a normal physiological phenomenon. 2. Pathological phenomenon: due to the pelvic axis of the overall excessive forward tilt caused by the overall backward protrusion of the buttocks, thus appearing in the sleep waist is hanging state. You can do exercises to correct the anterior pelvic tilt, such as plate support or deep squatting. If it is caused by physiological reasons to sleep waist is hanging, but no other symptoms of physical discomfort, follow-up continuous observation can be, if caused by pathological reasons, it is recommended to seek medical attention in a timely manner.