Sleepy legs and leg pain may be caused by lumbar disc herniation, poor blood flow and leg fatigue. 1. Lumbar disc herniation: if you have frequent symptoms of leg pain, lumbar disc herniation is likely to occur. The most common symptoms of the disease are lumbar pain, neuralgia, pain in the back of the thigh and the outside of the leg. In addition, there will be symptoms of leg pain. 2. Poor blood flow: There are also some patients who suffer from leg pain due to incorrect sleeping position, because being in the same sleeping position for a long time during sleep will lead to pressure on the veins of the legs, and the blood can not return normally. 3. Leg fatigue: There are also some patients who suffer from leg pain due to excessive exercise, such as running, swimming and other leg exercises. If the legs are overused, prolonged pressure will lead to leg fatigue. Sleepy legs and leg pain may also be caused by other factors, so we suggest that the person should consult the doctor in time, ask the doctor to clarify the cause of the disease and give targeted treatment.