If there are symptoms of leg pain when sleeping in the middle of the night, there may be the following diseases: 1, patients with lumbar disc herniation may be too soft because the bed leads to deformation of the lumbar vertebrae, aggravating the degree of lumbar disc herniation, compression of lumbar vertebrae nerves and leg pain; and lumbar disc herniation patients are usually in the majority of the time in the bending or sedentary state, the lumbar vertebrae damage is relatively large; if this time the bed is too soft, lumbar vertebrae often do not get rest will appear lumbar pain, leg pain symptoms, especially when sleeping to midnight. If the bed is too soft, the lumbar vertebrae can’t get rest for many years, and there will be lumbar pain, leg pain, especially when sleeping in the middle of the night, pain. 2, patients with pyriformis syndrome due to the living and sleeping environment is relatively poor, cold and humid easily stimulate the pyriformis muscle that is inflammation, which aggravates the sciatic nerve compression symptoms triggered by leg pain, especially because of the cold leading to the pyriformis syndrome of the patients, it’s easier to have a seizure at night.