Sleeping buttock pain is considered to be related to femoral head necrosis, lumbar intervertebral disc herniation, pyriformis syndrome, bone fracture and so on. 1. Necrosis of femoral head: ischemic necrosis of femoral head caused by trauma, alcohol consumption or long-term hormone use, mainly manifested as hip pain, which can involve the hip to cause pain, and limitation of hip abduction activities, which can be clearly diagnosed by MRI of hip joint. 2. Lumbar intervertebral disc herniation: if compression of nerves can radiate to the buttocks and cause pain, it may also radiate to the lower limbs and cause pain and numbness, which can be clearly diagnosed through lumbar MRI. 3. Piriformis syndrome: Piriformis syndrome is caused by trauma or strain injury, compression of the sciatic nerve can cause pain in the buttocks and radiate to the back of the thigh. 4. Fracture: If you suffer from traumatic buttock pain, accompanied by activity limitation, consider the possibility of fracture, need to take a clear diagnosis. Sleeping buttock pain has a complex etiology, it is recommended to go to the hospital to clarify the cause of further treatment.