How Did Ice Age Humans Sleep Without Freezing to Death?

Imagine switching off the heating, throwing away your mattress and lying down on frozen ground for a 16-hour winter night. In a study published in 1958, local men in the Australian desert slept comfortably on nights close to freezing, while volunteers next to them shivered and slept badly. So how did Ice Age people survive the night? We follow five clues: 200,000-year-old grass beds, mammoth-bone houses, the eyed needle, the human body's own cold tricks, and a pit of bones in Spain that has scientists arguing about hibernation. 0:00 Could you survive one Ice Age night? 1:02 Why sleep is the dangerous part 1:22 Why fire wasn't enough 2:17 Clue 1: the bed 3:44 Clue 2: the wall 4:22 The igloo rule 5:05 Clue 3: the needle 6:20 Clue 4: the body 8:01 Sleeping as the night gets colder 8:23 Clue 5: the Pit of Bones 9:04 So how did they do it? What's the coldest night you've ever slept through? Tell me in the comments, and subscribe for more stories about how people really lived. Sources: Radomski & Buguet (2001), "From Pole to Pole - A Thermal Challenge" (the 1958 desert study) - https://apps.dtic.mil/sti/tr/pdf/ADP0... Leppaluoto & Hassi (1991), "Human Physiological Adaptations to the Arctic Climate", Arctic - https://journalhosting.ucalgary.ca/in... Christopher S. Baird, West Texas A&M University (2015), campfire heat - http://www.wtamu.edu/~cbaird/sq/2015/... Marquer et al. (2012), Mezhyrich hearths, Journal of Archaeological Science - https://www.sciencedirect.com/science... Wadley et al. (2020), Border Cave bedding (Wits University) - https://www.wits.ac.za/news/latest-ne... Sibudu bedding, 77,000 years (NPR, 2011) - https://www.npr.org/2011/12/08/143304... Nadel et al. (2004), Ohalo II bedding, PNAS - https://www.pnas.org/doi/10.1073/pnas... Chu et al. (2025), Mezhyrich chronology, Open Research Europe - https://pmc.ncbi.nlm.nih.gov/articles... Igloo - https://en.wikipedia.org/wiki/Igloo Toups et al. (2011), lice and the origin of clothing (University of Florida) - https://archive.news.ufl.edu/articles... Gilligan et al. (2024), Paleolithic eyed needles, Science Advances - https://www.sci.news/archaeology/eyed... Brown fat in adults (2009 studies) - https://harvardmagazine.com/updates/f... Yetish et al. (2015), sleep and night temperature (UCLA) - https://www.uclahealth.org/news/relea... Hibernation hypothesis, Sima de los Huesos (Archaeology Magazine, 2020) - https://archaeology.org/news/2020/12/... Sleeping pad - https://en.wikipedia.org/wiki/Sleepin... #IceAge #AncientHumans #Sleep #Prehistory #HumanHistory #Archaeology #Survival