Herniated lumbar discs hurt badly at night, usually due to two reasons: First, the bed is not flat enough or too soft when sleeping, resulting in a forward-flexed state of the waist, the intervertebral discs between the vertebrae are squeezed with increased force, and the protrusion is aggravated compared to the previous will lead to lumbar pain, or lower limb radiating pain and numbness will also be aggravated. Patients need to promptly change the mattress to latex cushion, maintain the state of hip and knee flexion, waist relaxation can effectively avoid the aggravation of lumbar pain. Second, at night, the lumbar region is prone to cold, especially in deep sleep when subconsciously uncovering the bedding, may lead to skin exposure and lumbar cold, once the lumbar region is cold will lead to a decline in blood circulation, venous reflux will lead to local inflammation and increased accumulation of metabolic products, it is easy to further aggravate the stimulation of peripheral nerves or nerve roots, the symptoms will also increase.