These go up to seven

Bill Gates has reviewed Why We Sleep. He writes (emphasis added throughout):

Does everyone really need seven or eight hours of sleep a night? The answer is that you almost certainly do, even if you’ve convinced yourself otherwise. In the words of Dr. Thomas Roth, of the Henry Ford Hospital in Detroit, “The number of people who can survive on five hours of sleep or less without impairment, and rounded to a whole number, is zero.”

This language matches a quote in the book:

To impress this fact further, I quote one of my research colleagues, Dr. Thomas Roth at the Henry Ford Hospital in Detroit, who once said, “The number of people who can survive on five hours of sleep or less without any impairment, expressed as a percent of the population, and rounded to a whole number, is zero.”

Walker is widely quoted making a very similar claim, but increasing the number of hours from five to six and the number of sources from Dr. Roth to “probably now about 10,000 empirical scientific studies.”

ESPN:

As Matthew Walker, professor of neuroscience and psychology at the University of California at Berkeley and founder and director of its Center for Human Sleep Science, says: “Based on the weight of probably now about 10,000 empirical scientific studies, the number of people who can survive on six hours of sleep or less without showing any impairment, rounded to a whole number and expressed as a percent of the population, is zero.”

Podcast Notes on Joe Rogan interview with Dr. Walker:

“The number of people who can survive on 6 hours of sleep or less, rounded to a whole number, and expressed as a percentage of the population is 0”

Bonus: Podcast Notes Revolution Health Radio interview with Dr. Walker:

“The number of people who can survive on 7 hours of sleep or less without showing any biological or cognitive impairment rounded to a whole number and expressed as a percent of the population is 0”

(Cue podcast to 20:30, quote includes the word “actually” before the zero.)

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