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Not staying hydrated with enough water during the day may be one of the big causes of leg cramps at night. This is most likely due to fluid imbalances of electrolytes (mainly sodium, potassium, calcium, and magnesium). Overuse of the muscles, perhaps from exercising, gardening or other physical activities.
Leg cramps can occur for no apparent reason, known as idiopathic leg cramps, or as a symptom or complication of a health condition, known as secondary leg cramps. Causes of secondary leg cramps can include: 1  pregnancy.  exercise.