00:00 — Introduction
00:20 — The Sleep We Lost
08:30 — Wrap Up
Sources:
- Roger Ekirch - Sleep Research, Virginia Tech: https://sites.google.com/vt.edu/roger-ekirch/sleep-research
- Roger Ekirch - Segmented Sleep Primary Sources: https://sites.google.com/vt.edu/roger-ekirch/sleep-research/segmented-sleep
- Harper's Magazine - Segmented Sleep by A. Roger Ekirch (2013): https://harpers.org/archive/2013/08/segmented-sleep/
- CNN - How Our Ancestors Used to Sleep (2022): https://www.cnn.com/2022/01/09/health/sleep-history-wellness-scn
- National Geographic - Is Sleeping Through the Night the Right Way to Sleep? (2024): https://www.nationalgeographic.com/science/article/polyphasic-biphasic-segmented-sleep
- HISTORY - The Modern Origins of the 8-Hour Sleep Cycle: https://www.history.com/articles/human-sleep-cycle-origins
- ScienceAlert - Humans Used to Sleep Twice Every Night (2025): https://www.sciencealert.com/humans-used-to-sleep-twice-every-night-heres-why-it-vanished
- Fortune - Harvard Professor Calls Out 'Lie' of 8 Hours of Sleep (2025): https://fortune.com/2025/10/30/harvard-professor-how-much-sleep-do-you-really-need-8-hours/
- Sleep Review - Sleeping in Two Shifts: A History of Biphasic Sleep (Podcast): https://sleepreviewmag.com/sleep-disorders/insomnia/sleeping-in-two-shifts-history-of-biphasic-sleep/
- Wikipedia - Polyphasic Sleep: https://en.wikipedia.org/wiki/Polyphasic_sleep
- Ekirch AR - Segmented Sleep in Preindustrial Societies, SLEEP (2016): https://pmc.ncbi.nlm.nih.gov/articles/PMC4763365/
- World Economic Forum - A Brief History of Sleep: https://www.weforum.org/stories/2014/11/a-brief-history-of-sleep/
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