What causes leg cramps in the calf when stretching during sleep?

Leg cramps during stretching while sleeping may be caused by the following reasons: 1. Cold exposure: If the legs are not kept warm during sleep, cold exposure may cause blood vessels in the lower leg to constrict, impairing blood circulation and leading to leg cramps when stretching. 2. Calcium deficiency: Low calcium levels are a common cause of leg cramps. When the body lacks sufficient calcium, muscle excitability increases, making cramps in the lower leg more likely during stretching. 3. Lumbar disc herniation: Individuals with lumbar disc herniation may experience increased muscle excitability in the lower leg due to nerve compression, resulting in cramps when stretching. In addition, factors such as excessive fatigue, poor posture, or prolonged maintenance of the same position may also increase the risk of leg cramps. If cramps occur frequently, it is advisable to seek medical evaluation promptly.