What are the benefits of a bed with moderate height to the human body?

The ancients advocated that the bed should be low, and the modern bed is also based on the ideas of the ancients. The height should be slightly higher than the knee of the sleeper, that is, generally 0.4~0.5m, which is convenient for getting on and off the bed. The bed is too high, which makes people nervous and affects sleep; If the bed is too low, it is easy to get wet, so that cold and dampness can easily invade the human body, which is not only easy to suffer from arthritis and other diseases, but also makes people feel uncomfortable and difficult to lie down.