Johnson told The Wall Street Journal in December that she can "easily" sleep for 14 hours a night, sparking debate about the optimal amount of sleep people should get each night. This story is available exclusively to Business Insider subscribers. Johnson told the Journal last month that she can't function during the day unless she sleeps for at least 10 hours. — Julia (@Julia17258673) December 13, 2023The Journal of Clinical Sleep Medicine (JCSM) recommends adults aged 18 to 60 get seven to nine hours of sleep every night. However, sleep scientist Roy Raymann told Business Insider in 2021 that oversleeping differs from person to person.

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