The Invention That Destroyed Human Sleep

Tonight, you'll probably struggle to fall asleep. Or you'll wake up at 2 a.m., stare at the ceiling, and wonder what's wrong with you. Nothing is. But something is wrong with the world you were born into — and it started with a single glass bulb invented in 1879. This video traces how artificial light quietly rewired the sleep of the entire human species. For 300,000 years, humans slept in two phases, with a peaceful, wakeful window in the middle of the night that they treated as sacred. Then electric light erased it — and most of us have never even felt what we lost. We explore the real science behind it: — The forgotten history of First Sleep and Second Sleep — The tiny brain structure that controls your entire body clock — Why blue light from screens tricks your brain into thinking it's noon — The camping experiment that reset people's biology in just 7 days If you lie awake at night feeling broken, here's the truth: your body isn't malfunctioning. It's looking for the darkness someone took away. Sources: Ekirch, A.R. (2001/2005). "Sleep We Have Lost" & "At Day's Close: Night in Times Past." Wehr, T.A. (1992). "In short photoperiods, human sleep is biphasic." Journal of Sleep Research. Wright, K.P. et al. (2013). "Entrainment of the Human Circadian Clock to the Natural Light-Dark Cycle." Current Biology. Chang, A.M. et al. (2014). Brigham and Women's Hospital — evening use of light-emitting eReaders. PNAS. World Health Organization — night shift work classification (IARC). 🛑 WATCH - What Did Ancient Humans Do Before Language ? [   • What Did Ancient Humans Do Before Language ?  ] 🛑 WATCH - The Dark Science of Loneliness [   • The Dark Science of Loneliness  ] #Sleep #SleepScience #CircadianRhythm #HumanHistory #WhyWeSleep