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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.
A pinched nerve from either a herniated disc or a bone spur rarely affects the legs. Cervical myelopathy can affect both the arms and the legs. Pressure on the spinal cord, as it runs through the cervical spine, can cause many symptoms. Cervical stenosis can cause weakness and spasticity in the legs. Spasticity means you to lose control over your legs and you may have a great deal of difficulty walking due to loss of control of where you place your feet.