Calf pain when sleeping at night may be due to excessive exercise during the day, too much exercise, too much sweating, and no timely salt replenishment, a large loss of body fluid and electrolytes, metabolic waste accumulation, so there will be night sleep, the calf muscle local blood circulation is not good, leg pain symptoms occur. There is also the cold environment in the winter daytime exercise, the warm-up activities are not adequately prepared, or swimming in the pool in the summer when the water temperature is too low, it is also easy to form the symptoms of calf muscle pain at night when sleeping. It may also be because the whole body is in a state of tension during the day when strenuous exercise, the calf muscles contract too quickly, the relaxation time is too short, the local metabolites lactic acid abnormal accumulation, muscle contraction and relaxation is difficult to regulate, which will also cause the symptoms of pain in the calf stomach when sleeping at night.