The main reasons for the special difficulty in sleeping legs at night include the following: first of all, it is considered to be caused by the varicose veins of the lower limbs of the body. Mostly due to long-term standing or heavy lifting and so on, resulting in poor venous reflux in the lower limbs, or congenital venous valve insufficiency, resulting in poor venous reflux in the lower limbs, which causes discomfort such as soreness and swelling in the lower limbs. The second consideration is due to the lack of trace elements in the body, mostly due to calcium deficiency and other causes of sleeping legs at night. The lack of calcium ions in the body at night when sleeping leads to an increase in muscle excitability and thus causes soreness and swelling in the legs. Then consider the leg discomfort due to excessive daytime activity or overexertion, resulting in leg muscle strain, which causes lactic acid accumulation. For this cause of leg discomfort, can be relieved by rest and with hot compresses.