The calf cramps at night may be caused by the following reasons: 1, calcium deficiency: can lead to leg cramps, especially at night when sleeping, the symptoms of cramps are more obvious, then to early calcium supplements, while supplementing vitamin D to promote the absorption of calcium, can relieve the symptoms of calf cramps. 2, cold: If the wind is cold at night when sleeping, or the environment is cold, it can lead to the symptoms of calf cramps at night. The first thing you need to do is to pay attention to warmth, while getting out of the cold environment and adding clothes to effectively relieve the symptoms of calf cramps. 3, neurological disorders: such as head tumors compressing the nerves, or due to seizures in the head and lead to calf cramps, to do the relevant head MRI, as well as neurological examination, to diagnose and treat.