I would say this depends of your definition of “hibernate.” Early man likely spent 20–23.5 hours a day in his home, cave, or den during the coldest parts of the winter. Imagine how cold it was not having layers of clothing especially designed for warmth. Think how cold your feet would get without thick layers of soft socks and commercial footwear. You don’t even have to go back to prehistoric man, even in the 1800’s, many families would bundle up and sleep 14–16 hours a day, or at least severely limit their activity, because it was dark and in many parts of the world, uncomfortably cold.