I live in the Balkan, where temperatures range from -20°C to +40°C, which I don't consider extreme. However, when it's so cold in winter, I have to change my habits a bit. Thicker wardrobe, thicker blanket, heating overnight, etc.
I remember, it was a long time ago at the beginning of 2000, it was winter, it was freezing outside, -22C, and I went to the cottage for a few days of rest.
When I arrived at a cold house after a long journey, I didn't have the strength or time to warm it up, so I put on thick pajamas, crawled under several blankets and covered my head. In the morning, my head was properly cooled, but I slept well. This was followed by the firing of the furnace and the continuation of the stay in not so extreme, cold conditions...