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Cortisol we’ve covered a bit earlier, but adrenaline is something you probably already know about. When we talk about adrenaline, we’re talking about fight-or-flight, get-up-and-go, Dwayne “The Rock” Johnson movie, built-in excitement! Guns blazing, tanks, walking away from the explosion in slow motion, the whole 9 yards. Adrenaline is an incredible part of our physiology that allows us to tap into our greatest strengths. Throughout evolution, adrenaline enabled us to either fight off a threat or run for the hills
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Shawn Stevenson (Sleep Smarter: 21 Essential Strategies to Sleep Your Way to a Better Body, Better Health, and Bigger Success)