What causes leg cramps at night during sleep?

Leg cramps during sleep at night may be caused by the following reasons: 1. Calcium deficiency: Reduced calcium ion levels in the blood increase neuromuscular excitability, making muscle spasms more likely. 2. Cold exposure: When the feet are exposed to cold, muscles may become stimulated and lead to cramping. 3. Improper sleeping posture: Pressure on the feet can impair local blood circulation, triggering cramps. 4. Excessive fatigue: Overexertion from too much physical activity or walking during the day may fatigue leg muscles and ligaments, resulting in nighttime cramps. 5. Underlying medical conditions: Certain diseases such as epilepsy or lumbar spine disorders (e.g., lumbar disc herniation, spinal stenosis) may also cause nocturnal foot cramps. If cramps occur frequently, it is recommended to seek medical evaluation to determine the exact cause.