Numbness in the hands and cramps, if it is nocturnal, including cramps in the calf stomach, in this case is most likely caused by calcium deficiency. On the other hand, if the numbness is indistinguishable from time to time, for example, including forearm or upper limb sensory abnormalities, the possibility of numbness caused by cervical spondylosis should be considered greater. Therefore, hand numbness regardless of day or night, you need to do a cervical spine nuclear magnetic examination or go to the hospital orthopedic department for professional examination to clarify whether there is cervical spondylosis or cervical spine problems.