[challenge] it is possible to prevent pressure ulcers Nesha, the abnormality is detected during sleep to generate the sleep disorders, to induce change Positions in attitude sleeping less likely to occur promptly sleep disorders when the sleep abnormality is detected or to provide a posture control bed system can be or extend the airway. And a bed with a back-up unit for causing the back side of the A Nesha, and bed support to support the bed, and a back-up for the drive unit which is inclined to increase the head side of the back-up part , a posture control bed system with the back-up unit, different inclination angles to be and a back receiving surface and head receiving surface with adjustable inclination when the back receiving surface is not inclined raised the angle and 0 , .theta.x the inclination angle of the back support surface when tilted raised, the inclination angle of the head receiving surface in the case where a reference 0 inclination extension of the back support surface when the inclination angle .theta.x .theta.y that time, the back-up for the drive unit, the back-receiving surface and the head receiving surface, posture control bed system is inclined raised so as to satisfy the following equation 1. [number 1] 0 < x 70 , and, -45 y <0 , and, -30 x + y (1) [ .The 2【課題】寝者の褥瘡を予防できると共に、睡眠障害を発生させる睡眠時異常を検知し、睡眠時異常が検知されたときには速やかに睡眠障害が起きにくい寝姿勢に体位変えを誘導したり気道を拡張したりすることのできる寝姿勢制御ベッドシステムを提供する。【解決手段】寝者の背側を起こすための背上げ部を有する寝台と、寝台を支える寝台支持体と、背上げ部の頭側を高めて傾斜させる背上げ用駆動部と、を備える寝姿勢制御ベッドシステムであって、背上げ部は、異なった傾斜角度に調節できる背受け面と頭受け面とを有してなり、背受け面が傾斜隆起していないときの傾斜角を0°とし、傾斜隆起させたときの背受け面の傾斜角をθx 、傾斜角θxのときの背受け面の傾斜延長線を基準0°とした場合における頭受け面の傾斜角をθyとするとき、背上げ用駆動部は、背受け面と前記頭受け面とを、下記数1を満たすように傾斜隆起させる寝姿勢制御ベッドシステム。[数1]0°<θx≦70°、かつ、-45°≦θy<0°、かつ、-30°≦θx +θy ・・・(1)【選択図】図2
