What causes leg cramps in the calves during sleep at night?

Possible causes of leg cramps at night include the following: 1. Electrolyte imbalance: Deficiency or imbalance of electrolytes such as calcium, potassium, and magnesium may increase neuromuscular excitability, leading to leg cramps. Calcium deficiency is particularly significant, as calcium ions play an important role in maintaining normal muscle function. 2. Muscle fatigue: Excessive physical activity or overuse of the legs during the day can lead to muscle fatigue. If muscle tension is not relieved at night and metabolic byproducts accumulate without timely elimination, this may trigger leg cramps. 3. Cold stimulation: During nighttime sleep, low room temperature or inadequate leg warmth may cause the lower legs to become chilled, potentially inducing muscle spasms.