Night foot cramps have systemic factors, may be related to the local, and systemic factors, including fever or epilepsy, or even calcium deficiency can cause foot cramps at night, local due to acute exercise, work fatigue or leg twisting and writhing caused by the leg, often lying down after the foot cramps obvious. At the same time, some people sleep in a bad position, such as lying on their backs for a long time so that the quilt pressed on the surface of the foot or a long time lying prone, the surface of the foot against the bed forcing certain muscles of the calf for a long time in a state of absolute relaxation, causing passive muscle spasms. At the same time fatigue, sleep, insufficient rest or too much rest have a relationship with foot cramps at night, because this can cause the accumulation of local acidic metabolites, which can cause foot cramps. In addition, cold stimuli, such as winter night temperature is relatively low, sleep with too thin blanket or feet exposed to the outside, may appear in the night foot cramps. The right way to treat nocturnal foot cramps is to target the cause and keep warm at the same time, so that the symptoms can be relieved.