Sleeping on a hard bed is good for the lower back, especially for patients with lumbar-related diseases to facilitate their recovery. When a patient has a lumbar-related disease, such as lumbar disc herniation, lumbar spine osteophytes, etc., the doctor will ask the patient to rest on a hard bed instead. At this time the hard bed can provide sufficient support to the patient’s lumbar spine, and during sleep can make the lumbar muscles fully relaxed, and then help the recovery of related diseases. If the patient sleeps on a soft bed for a long time, it may lead to some abnormal curvature of the spine and accelerate its degeneration, which will easily cause the patient to develop the above-mentioned lumbar diseases, so sleeping on a relatively hard bed will be beneficial to the patient.