The symptoms of cramps in sleep are as follows: 1. It may be due to local wind and cold when sleeping, which leads to muscle spasm and thus causes the clinical symptoms of cramps. 2. It may be due to a large amount of exercise during the day, which is too much and too strenuous and does not relieve muscle fatigue leading to abnormal muscle nerve conduction, thus causing the symptoms of cramps at night. 3. Calcium ions are one of the important component mediums of nerve conduction. If calcium ions are missing, it will easily lead to abnormal excitation of local nerves and thus symptoms of cramps. If you are not able to get any relief within a short period of time, you must go to a regular hospital in time to improve the necessary auxiliary examinations and choose a reasonable treatment method after the cause is clear.