Lying down and sleeping with numb legs is commonly caused by severe lumbar disc herniation, lumbar spinal stenosis, lumbar back fibrous tissue infection, etc. The details are as follows: First, severe lumbar disc herniation: continuous compression of nerve roots by nucleus pulposus tissue will cause inflammatory edema of nerve roots that cannot subside, so the symptoms of numbness in the legs when lying down and sleeping will appear; Second, severe lumbar spinal stenosis: severe lumbar spinal stenosis will also cause nerve Continuous pressure, the patient will show the numbness of the legs when lying down; third, lumbar back fibrous tissue inflammation: the patient will show lumbar pain, as well as lying down when sleeping leg numbness symptoms, when pressing the lumbar back muscles, will obviously touch the stripe-like structure, pressing the local will make the leg numbness symptoms relief. Numbness in the legs when lying down to sleep should be promptly consulted, the cause is diagnosed after the use of active treatment, can make the leg numbness symptoms can be relieved, sometimes also need to carry out surgical treatment.