Lying down to sleep in bed the whole buttock soreness, may be physiological factors, such as muscle lactic acid accumulation, etc., may also be due to pathological factors, such as lumbar disc herniation, myofibrositis. 1. Lactic acid buildup: If you exercise your buttocks muscles, such as squatting, the anaerobic metabolism of the buttocks muscles may lead to the production of lactic acid in the buttocks muscles, and the buildup of lactic acid may lead to buttock soreness. 2. Lumbar disc herniation: If the lumbar spine undergoes degenerative changes, the nucleus pulposus protrudes from the ruptured annulus fibrosus of the intervertebral disc, leading to compression of the adjacent spinal nerve roots, resulting in radiating pain. When lying in bed, if the lumbar spine is subjected to increased force, it will aggravate the symptoms of the disease and may lead to pain in the whole hip. 3. Myofibrositis: it is a kind of disease triggered by edema, exudation and fibrous degeneration of myofascia and muscle tissues due to chronic strain, cold, dampness, etc., which may lead to lifting leg and hip pain. In addition to the above reasons, trauma, pyriformis syndrome, femoral head necrosis, etc. may also lead to hip pain. If the situation of lying down and sleeping on the bed the whole buttock soreness can not be relieved by oneself, it is recommended to go to the regular hospital for consultation, according to the cause of the disease to give targeted treatment.