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    Michel Siffre, 85, Dies; Descended Into Caves to Study the Human Mind

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    He was a pioneer in chronobiology, the study of how our bodies understand the passage of time.On the morning of Sept. 14, 1962, reporters and onlookers began to gather around a hole in the ground, far up in the Maritime Alps between France and Italy. A few hours later, workers rigged a rope down into the darkness; soon they pulled out a small, sturdily built man named Michel Siffre.He had been inside the cave, 375 feet down, for 63 days, with only a four-volt lamp for illumination. He wore dark goggles to limit the glare of the sun, and he had to be carried to a waiting helicopter.This was no rescue: Mr. Siffre, a geologist, was conducting an experiment on himself, to see what would happen to his sense of time if he cut himself off from the normal day-night flow of life on the surface.It turns out that a lot could happen: Time as he experienced had “telescoped,” he said. His circadian rhythm of wakefulness and sleep stretched from 24 to about 25 hours. And what felt to him like one month was in fact two on the surface.“After one or two days, you don’t remember what you have done a day or two before,” he told Cabinet, an art and culture magazine, in 2008. “The only things that change are when you wake up and when you go to bed. Besides that, it’s entirely black. It’s like one long day.”Mr. Siffre, who died on Aug. 25 in Nice, was a leading figure in the field of chronobiology, the study of how the human body understands time. Previous scientists had speculated that, contrary to the prevailing idea at the time, our internal clocks are independent of the solar cycle, even as we usually adjust to its influence. Through decades of experiments beginning with that 1962 descent, he proved it.We are having trouble retrieving the article content.Please enable JavaScript in your browser settings.Thank you for your patience while we verify access. If you are in Reader mode please exit and log into your Times account, or subscribe for all of The Times.Thank you for your patience while we verify access.Already a subscriber? Log in.Want all of The Times? Subscribe. More

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      Obsessed with Sleep

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      The science behind popular methods for improving sleep, and the downsides of caring too much about it.Americans used to say we’d sleep when we were dead. We viewed sleep as a waste of time — something prized by the lazy, and minimized by the industrious.How times have changed. These days, getting in bed early is cool. People, especially those in younger generations, have come to better understand the benefits of a good night’s rest, and many now make sleep a central part of their personal health routines.Experts say this is a good thing: Consistently solid sleep can benefit your heart, brain, immune system and mental health. But our newfound love of sleep is also leading us to strange places. On social media, you can find some people mixing concoctions meant to induce sleep — called “sleepy girl mocktails” — and others trying on sleep aids like mouth tape, nose tape and jaw straps, sometimes all at once. For many, sleep has become something to be optimized, even perfected.Kate Lindsay has a fascinating new story in The Times today that explores this growing fixation — specifically, the large number of people for whom good sleep is not good enough. They are sometimes called “sleepmaxxers.” Kate’s story raises a question I’ve been wondering myself: After so many years of worrying too little about sleep, is it possible some of us have started worrying too much?In today’s newsletter, I’ll walk you through the science behind some popular methods for improving sleep, and the possible downsides of caring too much about it.A “sleepy girl mocktail.”Molly Matalon for The New York TimesWe are having trouble retrieving the article content.Please enable JavaScript in your browser settings.Thank you for your patience while we verify access. If you are in Reader mode please exit and log into your Times account, or subscribe for all of The Times.Thank you for your patience while we verify access.Already a subscriber? Log in.Want all of The Times? Subscribe. More

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      How to Check in on Your Emotional Well-Being

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      We know we should get a physical exam every year; we have annual reviews at work; some couples even do periodic relationship audits. And yet many of us don’t regularly check in with our emotional health — though it is arguably the most important contributor to overall well-being. The New York Times talked to experts […] More