Professor Thomas Laaser, a German plastic surgery expert, believes that sleeping on a hard bed is not conducive to sleep or human health, because the hard bed surface can not meet the needs of human body curves, resulting in a serious burden and various injuries to muscles and spine.
In the past, people could not explain why people kept turning over during sleep, but simply attributed it to a "natural" physiological phenomenon. Lasser said that the best position of the body during sleep should be the most relaxing position in the lower spine, so that the constantly tense pelvis and coccyx can rest. On the other hand, if the body can't be in this position, it will produce some kind of "oppressive" reflex movement to the spine. These "oppressive" movements cause sleepers to toss and turn in bed to rest the parts of the body surface that are under too much pressure. In this way, the quality of sleep will naturally be affected because of continuous turning over. Professor Laaser believes that the ideal mattress for sleepers should be a soft mattress that can meet the needs of human surface curves.