求翻译：对人体无害性早已众所周知，反之有促进睡眠的作用。将头部重量平均吸覆，达到全方面支撑，使你舒适安稳的入睡。是什么意思？

Harmless to the human body has long been known, whereas for the role of sleep. Head weight average review attained support to keep you comfortable and safe sleep.