Why Medieval Korea Had the World’s Most Advanced Home Heating System

For most of medieval Europe, winter meant smoky fireplaces, freezing nights, and waking up beside a dying fire. But in Korea, ordinary families slept warm and comfortable thanks to a revolutionary technology called ondol, a radiant stone floor-heating system centuries ahead of its time. In this calm and atmospheric documentary for sleep, we explore the surprisingly advanced engineering of Korea’s ondol: How the ondol system worked Why it was more efficient than fireplaces How it shaped Korean homes, furniture, cooking, and daily life The science behind heated stone floors Why historians consider ondol one of the greatest medieval innovations This slow, detailed, and relaxing history is perfect for listening while falling asleep, studying, or unwinding at night. 💤 Welcome to Quiet Boring Sleep — where we tell deep, peaceful historical stories that help you relax and learn at the same time. If you enjoyed this video, please like the video, subscribe to the channel, and turn on the bell, so you never miss a new sleepy documentary.