If we think about other sectors of society -- the aged; if you are aged, then your ability to sleep in a single block is somewhat disrupted, and many sleep, again, less than five hours a night.
社会の他の層 お年寄りを見てみましょう お年寄りは まとめて眠る能力が衰えて 何回にも分けて 寝ることになりますが 一晩で５時間未満です