Sleeping in the middle of the night, the cause of cold on both sides of the waist is the waist is cold. In normal people, the thermoregulatory center is inhibited during sleep, and after entering deep sleep, the body cannot regulate the skin surface temperature normally, and cannot improve the blood supply with the change of ambient temperature, therefore, if the ambient temperature is too low, it will lead to cold in the lumbar region. The clinical manifestations are lowered skin temperature of the lumbar region, soreness of the lumbar muscles, and stiffness and muscle tension of the lumbar region if the lumbar flexion and extension activities are performed. If you have the above symptoms, microwave therapy, far infrared therapy, drug iontophoresis and other treatments can be applied to the lumbar area to quickly relieve the symptoms of cold and pain in the lumbar area, and you should pay attention to keep the lumbar area warm before going to bed.