Sleep linked to slower aging: huge study pinpoints the right amount

If you happen to sleep less than six hours or more than eight and think that it's enough to catch up on the weekend, there's a discovery that might change your mind: an analysis of half a million adults found that both those who sleep too little and those who sleep too much show signs of accelerated aging, measured on almost two dozen different biological clocks. The theory is simple but surprising: it's not just sleepless nights that make you age faster — sleeping too much also risks having the same effect. And the right range seems to be narrower than previously thought: between six and eight hours of sleep per night, no more, no less. The idea that "the more you sleep, the better" is completely overturned here. The protagonist of this story is Junhao Wen, a neuroscientist at Columbia University, who, among other things, is a light sleeper: he often wakes up at night, and for this reason he wanted to understand the impact of sleep on the organs, not just on the mind. He and his colleagues worked on data from the UK Biobank, a huge database of over 500,000 people with information on lifestyle, brain images, and blood samples. They cross-referenced this data with 23 different "biological clocks", each calibrated to specific organs — heart, liver, brain — and the surprise was that each organ ages in its own way. But the most surprising finding is not just the scientific precision: Wen and his team found very few genetic links to sleep habits. This means that, in most cases, how much you sleep depends more on habits and environment than on DNA. Abigail Dove, a neuroepidemiologist from Stockholm, sums it up as follows: “Sleep is a tool that we can modify. And it affects all the organs." Imagine: if you could really extend the life of your kidneys, heart, and brain, just by changing when you go to sleep — it doesn't require medication, just discipline. A curious detail: in one of the previous studies, the point of least distance between biological age and real age was for those who slept exactly seven hours. Below or above that, aging accelerated. And the six-to-eight-hour range is also confirmed in this latest large-scale study. We often think that lost hours are made up, or that everyone has their own unique "need". But this data suggests that there is a fairly precise window that applies to almost everyone — and that the body does not easily forgive deviations. Now, there is a perspective that is usually missing when it comes to sleep: society often celebrates those who "sleep little and work hard", as if it were a sign of strength. But perhaps, perhaps, true strength—and true longevity—lie precisely in defending those seven hours as if they were an investment, not a weakness. So the next time someone brags about sleeping only five hours a night, you have a new answer: it's not efficiency, it's an aging accelerator. The phrase to remember is this: sleeping between six and eight hours is not just a choice for well-being, it is a strategy to slow down the biological clock. If this discovery has made you rethink your relationship with sleep, you can indicate it on Lara Notes with I'm In — it's not a like, it's a way of saying that this idea now belongs to you. And when you tell it to someone who plays tough with coffee and short nights, you can tag them with Shared Offline: because certain conversations deserve to stay. This story comes from Nature and saved you 8 minutes.