Leg cramps occur in the morning, there is no scientific basis to confirm that leg cramps are growing in height, leg cramps occur in the morning, mostly due to the following reasons: 1, incorrect sleep posture at night, the calf area is compressed for a long time, poor local blood circulation and induced cramps; 2, stimulated by wind and cold, the legs are exposed for a long time during sleep at night, as well as long-term blowing air conditioning leads to cold stimulation of the calf area, which triggers leg cramps; 3, calcium deficiency, due to long-term calcium deficiency or malnutrition in the body, resulting in abnormal excitement of the leg muscles and induced cramps.