The headline is broadly defensible, but the qualifications matter. Effect sizes vary by population, the strongest claims rest on shorter trials, and credible voices push back on how it's typically framed.
Beautiful observations by Dr. Nedergaard and others found that in animal models, and now we know this is also true in humans, when you go to sleep at night, the vasculature that goes into your brain, because of course your brain does get artery inflow, okay? You have to give a blood supply, oxygenated blood to the brain, and it actually comes up from the bottom of the brain.
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Bookmarking — the dossier-vs-overview split is the right call. Most of the time I want overview; sometimes I want receipts.
Would love a "what would change this verdict" RSS feed. Sign me up if it exists.
And the answer is, the clearance of waste products from your brain, which occurs through essentially what is the lymphatic system of your brain during sleep, doesn't get the opportunity to do that when you don't get enough sleep.
However, during sleep, what happens is the areas around the vasculature that goes into the brain literally spreads out. They call it the perivascular space. Literally, it's as if every bit of vasculature has a little area around it where there aren't neurons, and that space gets 60% larger in sleep.