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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.
Ankle and leg cramps at night are involuntary spasms that produce aching or contractions of muscles in the legs near the ankles, explains Mayo Clinic. Nighttime cramps often involve the muscles, and as a result, some people experience pain in the feet and thighs in addition to the ankles and legs. Learn more about Pain & Symptoms