LOL that is so cool that your pets are keeping you warm! Yes definitely Hammie sleeps in my bed with me and keeps me warm all night long.
I think people have dealt with far more cold than we have now. Think about the Eskimos and people in Siberia and so on. They would be very jealous of the modern conveniences we have.
But that being said, different bodies are naturally meant to handle different levels of heat. The Eskimo people have bodies which can tolerate heat much better than a typical Nigerian person does. So some of that is about biology.
