What Would Happen If You Didn't Sleep for 264 Hours?

What happens to your mind and body if you stay awake for 264 hours, and why do we need sleep at all? From a teenager who tried it in 1963 to a jellyfish with no brain, here is what sleep research has found. In 1963, seventeen-year-old Randy Gardner tried to prove that nothing bad happens if you skip sleep. We follow his eleven days, then look at the studies behind what sleep does: mood, memory, connections between neurons, DNA repair, and even the gut. We also look at the animals and the families that show what happens when sleep goes missing. CHAPTERS 0:00 What happens if you don't sleep for 264 hours? 0:59 What breaks first? 3:37 What does sleep do for your brain? 6:24 Why would an animal with no brain sleep? 9:07 Can anyone live without it? 11:03 So, what happened to Randy? STUDIES AND SOURCES Opening quote (Allan Rechtschaffen): https://news.uchicago.edu/story/allan... Randy Gardner: Gulevich, Dement and Johnson, 1966 https://doi.org/10.1001/archpsyc.1966... NPR, 2017: https://www.npr.org/2017/12/27/573739653 Sleep loss and the emotional brain: Yoo et al., Current Biology, 2007 https://www.cell.com/fulltext/S0960-9... Six-hour nights: Van Dongen, Maislin, Mullington and Dinges, Sleep, 2003 https://doi.org/10.1093/sleep/26.2.117 Rose scent during sleep: Rasch et al., Science, 2007 https://www.science.org/doi/10.1126/s... Synapses shrink during sleep (mice): de Vivo et al., Science, 2017 https://www.science.org/doi/10.1126/s... Brain-wash debate: Xie et al., Science, 2013 https://pubmed.ncbi.nlm.nih.gov/24136... Miao et al., Nature Neuroscience, 2024 https://www.nature.com/articles/s4159... Nedergaard group reply, 2025 https://www.nature.com/articles/s4159... Jellyfish sleep: Nath et al., Current Biology, 2017 https://www.cell.com/current-biology/... DNA repair during sleep (zebrafish): Zada et al., Nature Communications, 2019 https://www.nature.com/articles/s4146... Sleep-deprived rats: Rechtschaffen et al., Science, 1983 https://www.science.org/doi/10.1126/s... Sleep loss and the gut (flies and mice): Vaccaro et al., Cell, 2020 https://doi.org/10.1016/j.cell.2020.0... Frigatebirds sleeping in flight: Rattenborg et al., Nature Communications, 2016 https://www.nature.com/articles/ncomm... Fatal familial insomnia: Lugaresi et al., NEJM, 1986 https://doi.org/10.1056/NEJM198610163... Medori et al., NEJM, 1992 https://www.nejm.org/doi/full/10.1056... Dream deprivation: Dement, Science, 1960 https://www.science.org/doi/10.1126/s... A NOTE ON THE SCIENCE Several findings in this video come from mice, flies, fish, rats and jellyfish, and are labeled that way on screen. Some questions, like whether sleep clears the brain's waste, are still debated. The smoke alarm, zipped folder, motorway and engine are analogies, not findings. This video is for education, not medical advice. Curious Sight makes science-first videos on the things we think we understand. Subscribe if you want the next one waiting when you wake up. #sleep #neuroscience #science