A previous study found that evening people are smarter than morning people. In a new paper, Kanazawa replicates the finding and provides a theoretical grounding. Because the nocturnal lifestyle allowed by electricity didn’t exist 10,000 years ago, we must now rely on general intelligence to override our early-to-bed instincts. So those with more of it stay up later. How much later? See below.
Bedtimes and wake-up times for Americans in their 20s by IQ.
Very Dull (IQ < 75)
Weekday: 11:41 P.M.-7:20 A.M.
Weekend: 12:35 A.M.-10:09 A.M.
Normal (90 < IQ < 110)
Weekday: 12:10 A.M.-7:32 A.M.
Weekend: 1:13 A.M.-10:14 A.M.
Very Bright (IQ > 125)
Weekday: 12:29 A.M.-7:52 A.M.
Weekend: 1:44 A.M.-11:07 A.M.”
Just saying.
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