The best sleeping position for pelvic misalignment is to lie flat on the back, with a pillow pad under the knees to reduce muscle pulling, thus reducing pelvic stress. Pelvic misalignment usually refers to the displacement of the pelvic sacroiliac joint or pelvic fracture caused by trauma and other factors, and requires manipulation or surgical treatment. The pelvis is then immobilized and braked using a pelvic immobilization belt or continuous traction of the lower extremities. The supine position minimizes the stress on the pelvic ring, which is most conducive to maintaining stability, and also facilitates pelvic traction, which allows the iliac crests of the pelvis to fit more closely to the sacrum. Sleeping in the side-lying position tends to cause an imbalance of force between the two sides of the pelvis, and the lower iliac crest is compressed, making it easy for the sacroiliac joints or the fracture ends to become dislocated again and aggravate the symptoms. When sleeping in the prone position, the iliac crests on both sides are pressurized, which may also cause the iliac joints or fracture ends to be dislocated and aggravate the symptoms. Pelvic misalignment is recommended to actively seek medical treatment and protection under the guidance of a physician.