# Does This Sleep Fasting Hack Actually Cut Cortisol? : 1508

An episode of [The Human Upgrade: Biohacking for Longevity & Performance](https://invisiblenetwork.ai/podcast/451295014), 26 Jul 2026, 10 min.

Audio: https://dts.podtrac.com/redirect.mp3/mgln.ai/e/p394/rss.art19.com/episodes/14aa5a4f-fae1-4336-8df6-8692fb56849d.mp3?rss_browser=BAhJIhVJbnZpc2libGVOZXR3b3JrBjoGRVQ%3D--0761ee75eb25694efc17849092f8583c07f6c68b

You’ve probably tried everything to sleep better. Magnesium. Melatonin. Blackout curtains. Maybe even expensive sleep gadgets. But what if the real reason your sleep feels broken has nothing to do with any of those things? In this video, Dave Asprey explains a hidden biological process that controls whether your body stays in stress mode at night… or finally switches into deep recovery mode. He breaks down why so many people wake up exhausted, why cortisol stays elevated while you sleep, and why your body may never fully enter repair mode even if you’re technically asleep. You’ll learn how one overlooked habit affects your brain, metabolism, recovery, heart rate, and overnight repair systems, plus the surprising research that showed dramatic changes in sleep quality from a single adjustment. Once you understand this mechanism, you’ll never look at sleep the same way again. Try Danger Creatine: https://dangercoffee.com/products/danger-creatine Try TrueDark glasses: https://truedark.com Try Danger Coffee: https://dangercoffee.com/discount/davetube Try Suppgrade Labs: https://shopsuppgradelabs.com/ I have spent twenty years and millions of dollars testing every legal focus drug I could get my hands on. In this video, I break down which compounds actually work, which ones are a waste of money, and the exact stack that delivers hours of clean focus without the afternoon crash. The shift is simple: focus isn't a willpower problem. It's an energy production problem inside your brain. Once you fuel it at the cellular level, deep focus stops being a struggle and becomes the default state. Thank you to our sponsors! • PredictiveMind™ | Get your Brain Pattern Mapping report at predictivemind.io/dave and use code DAVE for 10% off. • Viome | Check it out at viome.com and use code 16DAVE for 16% off. It’s time to stop guessing and start knowing your body. • iRestore | Reverse hair loss at www.irestore.com/DAVE and get exclusive savings on the iRestore Elite, use code DAVE 00:00 – Trailer 00:53 – Sleep Environment Matters 03:44 – Red Light Bulbs 04:50 – Blackout Curtains 05:16 – Light-Blocking Glasses 07:16 – Morning Supplement Stack 07:41 – Creatine for the Brain 11:48 – MCT Oil Fuel 13:06 – Cellular Cleanup (Autophagy) 15:12 – Magnesium for Sleep 16:56 – Full Stack Recap 18:26 – Biohacking Is Accessibl Connect with Dave Asprey! Website: https://daveasprey.com TikTok: https://www.tiktok.com/@daveaspreyofficial Instagram: https://www.instagram.com/dave.asprey/ Facebook: https://www.facebook.com/Daveaspreyofficial/ X: https://x.com/daveasprey YouTube: https://www.youtube.com/c/daveaspreybpr The Human Upgrade Podcast: https://www.instagram.com/ TheHumanUpgradePodcast/ https://m.facebook.com/Thehumanupgrade/ Dave Asprey’s BEYOND Conference: https://beyondconference.com/ Dave Asprey’s New Book - Heavily Meditated: https://daveasprey.com/heavily-meditated/ Dave's favorite supplements: https://www.shopsuppgradelabs.com/discount/DAVE15 Upgrade Labs: https://upgradelabs.com 40 Years of Zen: https://40yearsofzen.com See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.

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