https://news.livedoor.com/article/detail/20339484/
早起きする人はうつ病のリスクが低く幸福度も高いことが明らかに
Scientists discover one sleep habit is most likely to result in happiness
https://www.inverse.com/mind-body/being-a-morning-person-actually-keeps-you-
happier
Waking just one hour earlier cuts depression risk by double digits, study finds