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Continue to Chat日本人の睡眠時間、主要28カ国で最短 - ITmedia NEWS https://blog.40ch.net/2018/04/10/japanese-sleeping-time-shortest-in-28-major-countries/
日本人の睡眠時間、主要28カ国で最短 - ITmedia NEWS https://blog.40ch.net/2018/04/10/japanese-sleeping-time-shortest-in-28-major-countries/