There are three main reasons for hand numbness every night: first, neurogenic cervical spondylosis, which is due to inflammatory hyperplasia lesions in the cervical spine, and if the pillow is not suitable or high or low when sleeping, it may lead to physiological curvature straightening, resulting in the location of hyperplasia will stimulate the nerve roots, resulting in ischemia of the nerve roots, there will be hand numbness. Second, the oblique angle muscle syndrome, which is due to the obvious adhesions, scarring and degenerative tissue in the oblique angle muscle, may also be in sleep, especially when lying on the side of the local nerve travel position of extrusion stimulation, resulting in nerve bundle ischemia, also prone to hand numbness. Third, because the arm is pressed under the body when lying on its side, after a long time, it is easy to lead to pressure ischemia of the nerve in the arm, and also easy to appear the symptoms of hand numbness. After this situation should ensure that the pillow should not be too high or too low, try to lie on the side when the head, neck, torso in a straight line, and the pillow is best to choose latex pillow, because there is a good plastic effect, to avoid abnormal physiological curvature, help relieve symptoms.