１日に８時間以上寝る人は要注意！寝すぎが失明の原因になるって本当？
http://next.spotlight-media.jp/article/259326183436344646
EIGHT TO NINE HOURS OF SLEEP RECEIVES A NOD OF APPROVAL
http://www.nytimes.com/1983/05/11/garden/eight-to-nine-hours-of-sleep-receives-a-nod-of-approval.html
１日に８時間以上寝る人は要注意！寝すぎが失明の原因になるって本当？
http://next.spotlight-media.jp/article/259326183436344646
EIGHT TO NINE HOURS OF SLEEP RECEIVES A NOD OF APPROVAL
http://www.nytimes.com/1983/05/11/garden/eight-to-nine-hours-of-sleep-receives-a-nod-of-approval.html
