Some patients will feel lumbar pain after sleeping on a hard bed, the main reasons for this situation are as follows: 1, the patient sleeps on a bed that is too hard resulting in some patients pursue more extreme when improving a hard bed, such as laying only one layer of bedding on a light bed board, or using some very hard mattress. The lumbar muscles are not only not relaxed, but will also produce spasms, which will lead to pain. 2, may be caused by the patient is too thin, there are some very thin patients, when suddenly sleeping on a hard bed, due to some bone convex parts of the waist and the bed body in continuous contact, it may compress the soft tissue For example, if the patient sleeps in a soft bed for a long time, the muscles around the spine may be accustomed to an excessively bent position during sleep, and a sudden change may cause a transient muscle maladjustment, but after a period of time there will be significant relief.