Sleeping on a bed that is too hard can also cause pain around the body, especially in the lumbosacral region. The main reason is that the bed is too hard, the body can not comfortably fit with the bed when resting in bed, the body’s muscles can not be completely relaxed; sacral tail and other prominent parts of the body pressed tightly on the hard bed, while the forward-flexed waist is in a vacant state, can not be well flattened with the bed; waist and sacral tail no matter which part is in a state of stress tension, and over time it will instead cause uncomfortable pain all over the body. Therefore, sleeping requirements of the bed soft and hard moderate, the bed is too hard or too soft are not allowed.