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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.
Foot spasms may have many causes, and determining the specific cause may be difficult. An injury or assault to the nerves of the legs or feet may be one of the causes. This may occur as the result of injury from sports or work related activities, or it can be a side effect of many types of nerve diseases.