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They are very common when you're pregnant. There are lots of different causes for different people (like jinx said, a potassium deficiency can cause it too,) but the cause during pregnancy is almost always a calcium deficiency. Taking a calcium supplement right before bed completely cured it for me. (And on nights when I forgot to take it, I woke up with vicious calf cramps, without fail.) Might be worth a try, since women need all the calcium they can get anyway.
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