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4. Deep sleep. That's when the glymphatic system flushes misfolded proteins and waste out of your brain. Sinclair's view: a short night of genuinely deep sleep beats eight restless hours. He tracks it and pushes efficiency into the 90s.

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Jake Gilman

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If you have saggy eyes, a puffy face or deeper wrinkles, you're probably getting poor sleep. While you sleep, your brain's glymphatic system flushes out metabolic waste through cerebrospinal fluid. Skip sleep, and that waste builds up—showing on your face as bags under the eyes, drooping eyebrows, and a tired, aged appearance. Sleep quality is the first and most important factor for optimal glymphatic flow. I cover the 4 other crucial factors in the thread below.
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If you have saggy eyes, a puffy face or deeper wrinkles, you're probably getting poor sleep. While you sleep, your brain's glymphatic system flushes out metabolic waste through cerebrospinal fluid. Skip sleep, and that waste builds up—showing on your face as bags under the eyes, drooping eyebrows, and a tired, aged appearance. Sleep quality is the first and most important factor for optimal glymphatic flow. I cover the 4 other crucial factors in the thread below.

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Sleeping just 4 hours a night for two weeks increased visceral fat by 11% in healthy young men, with almost no change on the scale In other words, they were building up visceral fat (the deep, metabolically harmful fat packed around your organs) while body weight barely moved Even a single night of short sleep can trigger acute insulin resistance And when sleep loss continues, it can raise cortisol, increase cravings for high-energy foods, and drive higher calorie intake Over time, this creates a metabolic environment primed for visceral fat accumulation

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