At least 1 in 300 people have “advanced sleep phase,” (Science Alert) in bed by 8 pm and up at 4 or 5 am, according to new research. They sleep a regular schedule and get enough rest; they just do it extraordinarily early compared with most people. 91-year-old Betsey Thomas has been going to bed at 7 pm and up at 4 am (Deseret News) as long as she can remember.

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