Why Do We Dream? What Your Brain Really Does While You Sleep

Why do we dream? Every night your brain builds a world you never doubt, locks your body in place, and then wipes most of it before you wake. This video reveals what the dreaming brain is really doing, and why forgetting may be part of the plan. This video covers: • How REM sleep was discovered in a Chicago lab in 1951 • Why your body is paralysed while you dream • Sleep paralysis, kanashibari and the Old Hag • What changes in brain chemistry during REM • Threat simulation: dreams as a rehearsal for danger • Why so many dreams are about people, love and desire • The neurons that erase dreams, and octopuses that seem to dream Do you wake up remembering nothing, or with a whole movie in your head? Tell us below, and subscribe for more on how the human mind came to be. ────────── Sources: Aserinsky & Kleitman — Regularly occurring periods of eye motility, and concomitant phenomena, during sleep, Science, 1953 Izawa et al. — REM sleep-active MCH neurons are involved in forgetting hippocampus-dependent memories, Science, 2019 Pophale et al. — Wake-like skin patterning and neural activity during octopus sleep, Nature, 2023 Revonsuo — The reinterpretation of dreams: an evolutionary hypothesis of the function of dreaming, Behavioral and Brain Sciences, 2000 Valli et al. — The threat simulation theory of the evolutionary function of dreaming: evidence from dreams of traumatized children, Consciousness and Cognition, 2005 Revonsuo, Tuominen & Valli — The avatars in the machine: dreaming as a simulation of social reality, Open MIND, 2015 Eichenlaub et al. — Brain reactivity differentiates subjects with high and low dream recall frequencies, Cerebral Cortex, 2013 (Inserm summary) American Academy of Sleep Medicine — Zadra, sexual content in dream reports, SLEEP 2007 SRI International — The brain may actively forget during dream sleep, 2019 University of Washington — Octopus sleep shifts between quiet and frenzied stages, 2023 Smithsonian Magazine — The Stubborn Scientist Who Unraveled a Mystery of the Night Disclaimer: For educational and entertainment purposes. Some interpretations are actively debated among researchers and may change as new evidence emerges. Not professional advice. #whydowedream #dreams #remsleep #sleepscience #brain #sleepparalysis #evolution