During pregnancy, the phenomenon of uncomfortable legs while sleeping at night should be caused by poor lying position while sleeping, which compresses the inferior vena cava and causes obstruction of return flow, resulting in sore or painful legs. If the nerve is compressed, it will lead to numbness in the limbs, or even leg cramps after sleeping at night, which indicates a calcium deficiency. When the symptoms of difficult legs appear, you need to pay attention to the distinction and exclude the uncomfortable phenomenon caused by disease. If there is a disease, lumbar spine enlargement or varicose veins, the feeling of difficult legs will also appear. Physiological performance does not need treatment, they can slowly recover, caused by the disease, should take massage or physical therapy to improve the symptoms.