When sleeping with sore legs, it may be caused by the following reasons: First, it may be a long time standing, walking or doing some sports for a long time during the day, which leads to muscle fatigue of the lower limbs, causing the symptoms of sore legs, usually rest for two or three days to relieve the symptoms. Second, there may be muscle strain or chronic aseptic inflammation of the leg muscles, the most common is the long-term lower limbs to do heavy physical labor, physical exercise people. Third, there may be some lumbar spine diseases, compression of the nerve roots of the lower limbs and appear, common are lumbar disc herniation, lumbar spine slippage or lumbar spinal stenosis compression of the nerve roots of the lower limbs, which will appear in the lower limbs of the leg nerves have pulling pain or muscle soreness, numbness, weakness and other sensations. Generally, if you want to clarify the diagnosis of lumbar, you can go to the hospital to check the lumbar spine CT or MRI to confirm the diagnosis.