Cramps in the middle of the night have more reasons, may be related to the cold, sleeping posture is not correct, calcium deficiency and so on. 1. Cold: When the feet are suddenly cold, the cold stimulates the muscles of the feet to spasm, resulting in cramps in the middle of the night. Usually pay attention to keep warm, out of the cold environment, cramps can be gradually relieved. 2. Incorrect sleeping posture: may be sleeping process, long time foot in the same position, muscle stretching for a long time caused by muscle spasms, foot twitching, or even cause cramps. 3. Calcium deficiency: due to the low blood calcium content in the blood, resulting in muscle excitation, the emergence of midnight leg and foot cramps, especially in the adolescent population or older men are more common. When there is a foot cramp in the middle of the night, it is recommended to consult a doctor in a timely manner, follow the doctor’s instructions for further examination, with the help of the doctor to clarify the cause, and targeted treatment or therapy.