Why do you get cramp when you are asleep?

Answer:
There are two basic causes of cramping. One is inadequate oxygenation of muscle, where excess lactic acid, produced by anaerobic respiration, builds up and puts stress on the muscle.The other is lack of water or salt. Cramps from poor oxygenation can be improved by rapid deep breathing, as well as stretching the muscle. Cramps from lack of salt and water can be treated by stretching the muscle, and of course drinking water and increasing salt intake. Pounding on the muscle can increase soreness.Muscle cramps in particular can be treated by applying a soft massage on the cramped muscle, stretching the muscle and applying heat or cold. Heat improves superficial blood circulation and makes muscles more flexible, so some people find that heat is more soothing for muscle cramps than applying ice.

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I don't.

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Nor me, but I do suffer with it,

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you can lie awkwardly and cut off the blood supply, i was told years ago that you need to increase your calcium intake to stop cramps, dont know if its true tho

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Low potassium also can cause leg cramps. Eating more bananas should help (don't need more than 1 a day though) as well as staying hydrated. Regular chiropractic care also can help with leg cramps.

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