Why You're Always Tired (The 80/20 of Sleep)

You hit snooze this morning. Don't lie. Sleep science is a mountain. You don't need all of it. You need three rules that explain almost everything about why you're tired, and exactly what to do about it tonight. This is the 80/20 of Sleep: the 20% that explains 80%. ⏱️ Chapters 0:00 Why you're always tired 0:54 Rule 1: Tiredness is a chemical 2:54 Rule 2: Your clock runs on light 5:46 The 80% Bin: sleep myths 6:42 Rule 3: Sleep is the save button 8:30 Recap + what to do tonight 9:27 Next: the 80/20 of Dreams 🌙 Tonight, in 30 seconds 1. Coffee has a curfew: last cup by early afternoon. 2. Get outside light within an hour of waking up. 3. Same wake-up time every day, weekends included. 4. Before something important, sleep. That's the studying. 📚 Sources • Porkka-Heiskanen et al. (1997), Science: adenosine and sleep pressure • Borbély (1982), two-process model of sleep regulation • Fredholm et al. (1999), Pharmacological Reviews: caffeine and adenosine receptors • Drake et al. (2013), J Clin Sleep Med: caffeine 6 hours before bed • Gulevich, Dement & Johnson (1966), Arch Gen Psychiatry: Randy Gardner's 264 hours awake • Czeisler et al. (1999), Science: the human circadian period • Siffre (1963), Hors du temps: two months in Scarasson cave • Monk (2005), Sleep: the post-lunch dip • Wittmann et al. (2006), Chronobiol Int; Roenneberg et al. (2012), Curr Biol: social jet lag • Jones et al. (2019), Nature Communications: genetics of chronotype • Hirshkowitz et al. (2015), Sleep Health: 7–9 hours for adults • Harvey & Payne (2002), Behav Res Ther: imagery vs counting sheep • Depner et al. (2019), Current Biology: weekend recovery sleep • Ebrahim et al. (2013), Alcohol Clin Exp Res: alcohol and sleep • Jenkins & Dallenbach (1924), Am J Psychol: sleep and memory • Yoo et al. (2007), Nature Neuroscience: one night without sleep and memory • Van Dongen et al. (2003), Sleep: two weeks of 6-hour nights • Diekelmann & Born (2010), Nat Rev Neurosci: memory function of sleep Not medical advice. If you're consistently exhausted despite good habits, talk to a doctor. Conditions like sleep apnea are common and treatable. Narration uses an AI voice. Script, research and fact-checking by 80/20 Rules. Spotted Vilfredo the snail? Drop the timestamp. 🐌 Next: The 80/20 of Dreams. #sleep #8020rules #explained