How Did Ancient Humans Know When to Wake Up?

For forty thousand years, people woke up at the right time every single day with no clock, no alarm, and no word for "late". Here is how. Before clocks existed, waking up was not a problem anybody had to solve. The body already knew. This video is about the clock you were born with, the light that sets it, why your night used to come in two halves, and what we broke when we started telling the sun what to do. Chapters 0:00 The problem 0:54 Why "the sun" is not the answer 1:38 The clock you were born with 3:14 Light is the dial 5:12 Your body wakes before you do 6:47 The night was not one long block 8:59 Someone was always awake 10:19 The world had an alarm too 11:18 What we broke 13:00 Ending Ancient Mornings is about ordinary days in the deep past. How early humans woke at the right time, found food, kept warm, read the sky and marked the seasons, tens of thousands of years before any of it was written down. New video every week. #ancienthistory #prehistoric #earlyhumans