Young people at night calf soreness is very difficult to sleep may be the cause of sleep position, muscle strain, calcium deficiency, lower limb blood reflux or supply disorders. 1. Sleeping position: If the legs of the lower limbs are pressurized or curled up during sleep due to body position factors, resulting in pressure on the nerves in the legs, the phenomenon of soreness and distention of the calves may occur. 2. Muscle strain: daytime strenuous exercise, such as running, basketball, etc., the calf local lactic acid accumulation, gastrocnemius muscle strain, which in turn leads to calf soreness and discomfort. 3. Calcium deficiency: Calcium deficiency may lead to calf soreness and swelling, and there may also be calf muscle spasm and pain at night. 4. Lower extremity blood return or supply obstacles: If the lower extremity veins have thrombosis, varicose veins, etc., resulting in lower extremity blood circulation obstacles, which may lead to calf soreness and swelling. It is difficult to sleep with sore and swollen calves, it is recommended to go to the regular hospital to find out the cause and actively treat it.