Episode 2 of "Secrets of the Night" is devoted to humans and deals with the day-night rhythm that determines us and many living things. However, the triumphal march of light changed our relationship to night, just like our cities, the economy and our life itself. Studies have shown that someone who sleeps only 5-6 hours for weeks is as powerful as having a blood alcohol level of 1.0 per mill. So it makes sense that at some point we will get tired. And sleep: how does it work and why can't we exist without it? Watch "Secrets of the Night - Countryside" on the Get.factual channel: https://www.youtube.com/watch?v=3ZvVOQoFkYw -- Welcome to the official Get.factual youtube channel! 🌍 We are a documentary streaming channel covering history, science, technology, and nature. Explore worlds distant, forgotten, and unknown; from the depths of ocean trenches to the far reaches of the cosmos. New uploads of full-length documentaries and docu-series every week! Subscribe here: https://bit.ly/GetfactualSUB