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Sleep is the cheapest longevity tool on the planet — and most of us are doing it wrong. Dr jemma King, sleep researcher and author of *Sleep Smarter, Think Sharper, Feel Better*, breaks down the science of what actually happens when you close your eyes: from the human growth hormone spike that only hits in your first two sleep cycles, to why your late-night coffee is still in your bloodstream at 2 AM. This is one of those conversations that will change how you think about every single night. Practical, science-backed, and no fluff.