Why Are You Always Tired?

Why are you always tired, even after almost 8 hours of sleep? Hunter-gatherers with no alarm clocks sleep LESS than you, about six and a half hours a night, and insomnia is so rare among them that two of the groups have no word for it. Sleep studies of three hunter-gatherer groups, a camping experiment in Colorado and a new CDC report reveal the things that quietly drain your energy, and the everyday habit that can steal more than an hour of your sleep without you noticing. 0:00 Always tired? 1:10 7 in 10 adults are fatigued 1:49 How long do hunter-gatherers sleep? 2:55 Clue 1: Morning light 4:51 Clue 2: A steady body clock 5:53 Clue 3: Move (even a little) 7:16 Why your brain gets tired 8:39 The habit stealing your sleep 10:03 When to see a doctor 10:19 How to use all four clues 11:09 You're not lazy Sources: Young, Weeks & Elgaddal, "Fatigue Among Adults Age 18 and Older: United States, 2024", National Health Statistics Reports No. 221, CDC/NCHS, 2026 - https://www.cdc.gov/nchs/data/nhsr/nh... Yetish, Kaplan, Gurven, Wood, Pontzer, Manger, Wilson, McGregor & Siegel, "Natural sleep and its seasonal variations in three pre-industrial societies", Current Biology, 2015 - https://www.uclahealth.org/news/relea... Wright et al., "Entrainment of the human circadian clock to the natural light-dark cycle", Current Biology, 2013 - https://www.medicalnewstoday.com/arti... Roenneberg, Allebrandt, Merrow & Vetter, "Social jetlag and obesity", Current Biology, 2012 Pontzer et al., "Hunter-gatherer energetics and human obesity", PLoS ONE, 2012 - https://www.sciencedaily.com/releases... Puetz, Flowers & O'Connor, "A randomized controlled trial of the effect of aerobic exercise training on feelings of energy and fatigue in sedentary young adults with persistent fatigue", Psychotherapy and Psychosomatics, 2008 - https://news.uga.edu/low-intensity-ex... Wiehler, Branzoli, Adanyeguh, Mochel & Pessiglione, "A neuro-metabolic account of why daylong cognitive work alters the control of economic decisions", Current Biology, 2022 - https://www.sciencedaily.com/releases... Drake, Roehrs, Shambroom & Roth, "Caffeine effects on sleep taken 0, 3, or 6 hours before going to bed", Journal of Clinical Sleep Medicine, 2013 - https://pmc.ncbi.nlm.nih.gov/articles... MedlinePlus, "Fatigue" - https://medlineplus.gov/ency/article/... This video is for education, not medical advice. If you are exhausted most days and it doesn't get better, see a doctor - constant tiredness can be a sign of things like anemia, thyroid problems, depression or sleep apnea. Narration uses an AI voice. Illustrations are AI-assisted. #tired #sleep #evolution