Soft and weak feet at night when sleeping, the following common causes: First, long hours of standing work during the day, especially excessive exercise, can lead to soft and weak feet symptoms. Some patients with flat feet, due to the collapse of the arch, plantar muscle strength is weak, prolonged standing or walking can also lead to the symptoms of foot weakness, especially at night. Second, cervical spinal stenosis and severe cervical spondylosis can lead to cervical spinal cord compression and degeneration, and the patient will show symptoms of weakness of the feet. After walking during the day, the spinal cord nerve ischemia is aggravated, and the symptoms of weakness of the feet at night will be significantly aggravated. In summary, symptoms of weakness in the feet at night when sleeping should be promptly seen and the above diseases should be excluded. After diagnosis, it should be actively treated to avoid serious adverse consequences.