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Most of the time, no apparent cause for night leg cramps can be identified. In general, night leg cramps are likely to be related to muscle fatigue and nerve problems. The risk of having night leg cramps increases with age. Pregnant women also have a higher likelihood of having night leg cramps. Several conditions, such as kidney failure and diabetic nerve damage, are known to cause night leg cramps. But if you have one of these, you're most likely aware of it and have symptoms other than night leg cramps.
What Causes Leg Cramps? Leg cramps at night are called recumbency cramps, and are caused by spasmlike muscle contractions. You might also experience leg cramps after exercising if you are dehydrated. In both cases leg cramps can be caused by electrolyte or mineral imbalance in the body. If your leg cramps are brought on by exercise, you may be dehydrated.