Walker: Habitual 7.3-hour sleepers stabilized at 8.5 hours in sleep experiment
Dr. Matt Walker · #131 Matthew Walker: The Power of Sleep · Feb 22, 2022 · at 16:34
Dr. Matt Walker, neuroscientist and sleep researcher, describes clinical evidence showing individuals who feel rested on 7.3 hours still harbor sleep debt.
0:00 / 0:57exact quote · 57.7s
720p mp4 · rendered on demand · StarZero watermark
“They were sleeping about 7.3 hours every night, and they said subjectively, I feel fine. I feel well rested. So then they brought them into the laboratory for eight nights straight, And then they gave them an extended amount of time in bed. I think it was almost 12 hours time in bed. It could be a little wrong on that number. But more importantly, what they found was that despite arriving into the laboratory for that eight day experiment, on already a very solid average of getting consistently 7.3 hours a night on average, the first night when they had that extended sleep opportunity, They slept for a total of almost 10.5 hours, and then on the second night and on the third night, they were sleeping 9.5 hours a night, and then finally by the eighth day, they bottomed out at what seemed to be their true sleep need, which was about eight and a half hours.”
quote is from the automated transcript, cleaned for reading: filler sounds and stutters are removed, nothing is rephrased. names can be misheard (the analysis reads context, assessments check outside sources). how →
More from Dr. Matt Walker
Walker: Almost nobody is resilient across all health domains on six hours of sleep
“When you take a holistic view, what you find is that there is almost nobody who is completely resilient to that diet of six hours of sleep on all of those different measures. So some people are resilient to a lack of sleep in some domains, but they will be vul…”
Walker: Morning coffee's immediate wakefulness comes from drink temperature, not caffeine
“They say within a couple of minutes, you know, five minutes later, oh gosh, you know, I feel so much better. All right. I'm ready to face the world. And you think that that's the caffeine. That's nonsense. The caffeine isn't probably, you know, working within …”
Walker: Falling asleep immediately is a sign of accrued sleep debt
“Sleep is not like a light switch. Sleep is much more like landing a plane, that it takes time for you to descend down onto the terra firma of healthy, good sleep at night. And the reason I'm nervous when people say, look, I get into bed and I, you know, as soo…”
Walker: Sleep Loss Doubles Risk for Specific Cancers, Not All Cancers
“A lack of sleep can double your risk for Certain forms of cancer, and then name those cancers, and those, for example those cancers would be thyroid cancer, lung cancer, ovarian cancer myeloma, which is a form of a blood cancer linked to, it's in the ilk of so…”
Walker: Being struck by lightning is more likely than being a genetic short sleeper
“Statistically, you're far more likely to be, for example, struck by lightning in your lifetime than you are to be one of those genetic short sleepers. The lifetime odds of being struck by lightning is one in 12,000, just if anyone, if anyone's interested.”
Walker: Average US sleep dropped from 7.9 hours in 1942 to 6.5 hours
“There was a Gallup poll that was performed back in 1941 or 1940, I think it was 1942, sorry. And what they found was that On average the human adults in that survey reported sleeping 7.9 hours a night on average. But now, based on data from the National Sleep …”