Lower back pain when lying down is due to a strain or pull on one of the muscles of the lower back. Usually, when lying down, the lumbar muscles are in a tense state, while in standing or sitting or other positions, the lumbar muscles will not be pulled, so there will be no pain. So for this situation, sleep lying down, should let the lumbar muscles to maintain the state of relaxation, usually there are two measures can be relieved: one is in the lying position in the bilateral knee joints and calves under the pad quilt, so that the lumbar is in a state of relaxation, muscle relaxation after the pain does not occur, and sleep at night must pay attention to the lumbar warmth to avoid getting cold. Another method is to replace the mattress for latex pads, because latex pads have a very good molding effect, after lying down and lumbar physiological curvature to fully comply with the situation, so there will be no muscle pull and strain, can effectively relieve the pain.