Why You're Too Tired to Work But Not Too Tired to Scroll

Too tired to work, but not too tired to scroll? In one experiment, people who just watched numbers for twenty minutes ended up feeling more tired than people doing maths with them. We take the word "tired" apart like a battery on a workbench. Inside: boredom (sleepy and restless at once), why the phone feels like a charger and what a study that logged people's phones found afterwards, three famous fakes (the willpower tank, an untraceable decisions-per-day number and the hungry judges), your body clock (sleep inertia and social jet lag), what a little movement did in small studies, real mental wear, and the late hour. Plus a one-week light log to spot which kind of tired you've got. CHAPTERS 0:00 Just watching vs doing maths: one experiment 0:57 Part 1: bored (sleepy and restless at once) 2:02 Why the phone feels like a charger 3:16 Three fakes: the willpower tank, a decision count, the hungry judges 4:15 Part 2: the clock (sleep inertia, social jet lag) 5:15 Part 3: sitting still (walks, stairs, easy cycling) 6:32 Parts 4 and 5: real wear, and the late hour 7:44 When to see a doctor, and which light is on SOURCES • Milyavskaya, Inzlicht, Johnson & Larson (2019). Neuropsychologia 123. https://doi.org/10.1016/j.neuropsycho... • Shen, Barbera & Shapiro (2006). Sleep Med Rev 10. https://doi.org/10.1016/j.smrv.2005.0... • Westgate & Wilson (2018). Psychol Rev 125. https://doi.org/10.1037/rev0000097 • Danckert et al. (2018). Conscious Cogn 61. https://doi.org/10.1016/j.concog.2018... • Merrifield & Danckert (2014). Exp Brain Res 232. https://doi.org/10.1007/s00221-013-37... • Bench & Lench (2019). Emotion 19. https://doi.org/10.1037/emo0000433 • Dora et al. (2021). R Soc Open Sci 8. https://doi.org/10.1098/rsos.201915 • Knierim et al. (2026), preprint. https://arxiv.org/abs/2602.16279 • Albulescu et al. (2022). PLoS ONE 17. https://doi.org/10.1371/journal.pone.... • Hagger et al. (2016). Perspect Psychol Sci 11. https://doi.org/10.1177/1745691616652873 • Decisions-per-day claim, fact-check (didtheresearch). https://didtheresearch.substack.com/p... • Danziger, Levav & Avnaim-Pesso (2011). PNAS 108. https://doi.org/10.1073/pnas.1018033108 • Weinshall-Margel & Shapard (2011). PNAS 108. https://doi.org/10.1073/pnas.1110910108 • Glöckner (2016). Judgm Decis Mak 11. https://doi.org/10.1017/S193029750000... • Wertz, Ronda, Czeisler & Wright (2006). JAMA 295. https://doi.org/10.1001/jama.295.2.163 • Hilditch & McHill (2019). Nat Sci Sleep 11. https://doi.org/10.2147/NSS.S188911 • Monk (2005). Clin Sports Med 24. https://doi.org/10.1016/j.csm.2004.12... • Roenneberg, Allebrandt, Merrow & Vetter (2012). Curr Biol 22. https://doi.org/10.1016/j.cub.2012.03... • Wennberg et al. (2016). BMJ Open 6. https://doi.org/10.1136/bmjopen-2015-... • Randolph & O'Connor (2017). Physiol Behav 174. https://doi.org/10.1016/j.physbeh.201... • Puetz, Flowers & O'Connor (2008). Psychother Psychosom 77. https://doi.org/10.1159/000116610 • Puetz, O'Connor & Dishman (2006). Psychol Bull 132. https://doi.org/10.1037/0033-2909.132... • NICE guideline NG206 (2021), ME/CFS. https://www.nice.org.uk/guidance/ng206 • Wiehler et al. (2022). Curr Biol 32. https://doi.org/10.1016/j.cub.2022.07... • Möller (2023). J Cereb Blood Flow Metab. https://doi.org/10.1177/0271678X22113... • Kroese, De Ridder, Evers & Adriaanse (2014). Front Psychol 5. https://doi.org/10.3389/fpsyg.2014.00611 • Hjetland et al. (2025). Front Psychiatry 16. https://doi.org/10.3389/fpsyt.2025.15... • Galland-Decker, Marques-Vidal & Vollenweider (2019). BMJ Open 9. https://doi.org/10.1136/bmjopen-2018-... • NHS: Tiredness and fatigue. https://www.nhs.uk/conditions/tiredne... This video is psychology curiosity, not medical advice or a diagnosis. Tired for a few weeks and not sure why, or is it getting in the way of your life? Please see a doctor. Several findings come from small or single studies; the caveats are in the video. MUSIC "Journey To Ascend", "Anguish", "Kumasi Groove" and "Deep Relaxation" — Kevin MacLeod (incompetech.com) Licensed under Creative Commons: By Attribution 4.0 License http://creativecommons.org/licenses/b... Sound effects: CC0 (Freesound). Narration voice is AI-generated. Animation, script and research are original to this channel. #psychology #tired #boredom