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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.
Foot Cramps at Night. Foot cramps are forced spasms of the muscles that are painful and sometimes very intense. These can occur for few seconds to few minutes but are very unpleasant. Calf muscle cramps, toe cramps or primarily it occurs in arch of foot. Some of the primary causes includes medication, dehydration, fatigue, chemical deficiency etc. It is very common in night while one is sleeping and could occur during day too. Aged people are more likely to get this problem(people over 70-80).