Children difficult to sleep foot numbness may be physiological factors, may also be the manifestation of certain diseases, such as calcium or vitamin deficiency, multiple peripheral neuritis. 1. Physiological factors: children may be squatting for a long time or sleeping in an inappropriate position leading to compression of the lower limbs, resulting in lower limb blood circulation is impeded to a certain extent, the peripheral circulation function is poor, which can lead to children’s feet numbness symptoms. 2. Pathologic factors: (1) lack of calcium or vitamin deficiency: children lack of calcium or vitamin easy to cause foot numbness, especially the lack of vitamin B, may lead to nutritional metabolism impediment, resulting in slow nerve conduction, which may cause numbness of the feet, and in severe cases there will be foot cramps, soreness and swelling and other symptoms. (2) Multiple peripheral neuritis: it may be caused by infection, allergy, etc. The main manifestation is symmetrical sensory abnormality of distal limbs, such as pain, numbness, which may be manifested as numbness of feet. If physiological causes are excluded, timely consultation should be made to ask the doctor to specify the cause of the disease, and appropriate treatment should be carried out if necessary.