| Today’s letter |
| Two minutes in the dark, and your bedroom gives itself away |
| In April 2007, Arianna Huffington was working eighteen-hour days to build a news website. She was at home, on the phone and checking her email, when she collapsed. Her cheekbone broke on the way down, and she woke up in a pool of blood with a cut over her eye. |
| Doctors tested her for weeks and found nothing wrong with her. She was exhausted, and that was the whole answer. Almost twenty years later she is everywhere again, because sleep is the thing everyone is optimizing now. Sleepmaxxing, they call it: the trackers, the rings, the cooling mattress pad, the magnesium powder before bed. Nobody in that feed is selling the one change that costs nothing. |
| “I did everything right. Why am I still so tired?” |
| She was not a fragile person. Building a news company while raising two daughters, she ran on very little sleep for years, because that seemed to be what the job asked. The one thing she could not outwork was the tiredness itself. |
| When it caught up with her, the advice was the same advice you have heard. Try harder. Manage your stress better. Get stricter about your bedtime. Every one of those answers puts the problem inside the woman, and for a while she believed it, because nothing else was on offer. |
| Here’s what gets me. |
| Nobody in all those weeks of testing ever asked what her bedroom looked like at two in the morning. None of it was her fault. |
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| Let me show you how I know. Not with my opinion, because I am not a doctor, but with a study. |
| Researchers at Flinders University in Australia strapped light sensors to the wrists of 88,905 adults in Britain. The sensors read the light around each person every minute, day and night, for a full week, which came to more than 13 million hours of light between them. More than half of the group were women, and the average age was 62. |
| Then the team waited. Up to nine and a half years later they counted who had developed heart disease, and they sorted everyone by how bright the hours between half past midnight and six in the morning had been. |
| What they found |
| Flinders University, 2025. Windred et al., JAMA Network Open. |
| The brightest nights (56% more heart failure) |
| Compared with the half whose nights stayed dark, the tenth of people with the brightest nights had 56% more heart failure and 47% more heart attacks. The link held after the team accounted for how long people slept, how much they weighed and how active they were. |
| The darkest nights (the advantage held) |
| Women usually carry some natural protection against heart failure. It showed up in the women whose nights stayed dark. In the women with the brightest nights, it was missing. |
| The brightest group averaged around 100 lux at night, which is a dimly lit hallway and not a floodlight. |
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| In other words, how bright her nights were said something about her heart that her bedtime and her sleep hours did not. |
| Her willpower had nothing to do with the light in that room. Neither does yours. |
| How does a little light on a closed eyelid reach your heart? |
| Your body keeps time by light. Special cells at the back of the eye have nothing to do with seeing, and their one job is to tell the brain whether it is day out. Those cells keep reporting through closed eyelids, so a hallway lamp or a street light through the gap in a curtain can still read as daytime. When that message arrives at two in the morning, the body makes less melatonin, and blood pressure and heart rate appear to settle less than they should overnight. One night of that is nothing. Years of it may show up in the numbers your doctor reads back to you. |
| Arianna Huffington never stood a chance in that bedroom. Neither did you, I’d bet, in yours. |
| That’s the part no one says out loud. Her room was working on her all night, and not one piece of advice she got was aimed at the room… it was all aimed at her. |
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| Try this today |
| Tonight, get into bed, turn everything off, and then lie there for two minutes with your eyes open. As they adjust, the room fills up with lights you stopped noticing years ago: the standby dot on the television, the charger brick, the strip under the door, the sliver where the curtains do not meet. Now take away what you can. A piece of black electrical tape covers a standby light for good, the phone can charge out in the hall, and a folded towel along the bottom of the door takes ten seconds. For the window, pull the curtains all the way across, and if the street light still wins, a sleep mask from the drugstore finishes it for a few dollars. One more thing… if you get up in the night, leave the overhead light alone and use the dimmest lamp in the house. |
| Darkness is the one part of sleep nobody can sell you. You just take it. |
| Promise me you’ll try it today? Saying it out loud is half of what makes it stick. |
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| None of this works because darkness is magic. It isn’t. The eye is a clock, and a dark room simply stops sending it the wrong time. |
| Arianna Huffington got there eventually. She changed what her bedroom was allowed to do, and these days her phone charges in another room instead of on the nightstand. That took a collapse and a broken cheekbone to learn. |
| You get to skip that part. There’s still time for you. |
| So tonight, when the lights go out, let them actually go out… |
| It was never your fault. |
| — Cole |
| P.S. Stand in your bedroom tonight with the lights off, wait a minute, and count the little lights you can still see. Hit reply with that number and nothing else. I’ll tell you tomorrow how you compare. |
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