The following are possible reasons for sleeping with weak legs: 1, fatigue, if suddenly overworked or too much exercise, may lead to rapid muscle contraction, spasm, sleep will lead to a large amount of lactic acid accumulation at the muscle, resulting in weak legs, soreness, without treatment, rest for a few days can be self-relieved. 2, lumbar disc protrusion, if sedentary or bending, will lead to lumbar disc protrusion, the main symptom is lumbar pain The main symptoms are pain in the lower back, swelling, unfavorable activity, and in severe cases, compression of the sciatic nerve, resulting in radiating pain in the buttocks, lower limbs and feet. If the lumbar disc compression is more serious, it will also lead to weakness and numbness in the lower limbs. Treatment can be given to Siwei Pu pain relief, lumbago capsules to relieve pain, acupuncture, massage, ultrasound drug introduction, lumbar traction, Chinese medicine foot soak and other physical therapy to relieve pain, usually also need to sleep on a hard bed.