I find learning the origins of words and phrases fascinating. With winter coming here in Canada here's an origin that you might find interesting as well. The phrase is "Three Dog Night". This phrase originated with Canadian Inuit People. It gets very cold at night in the Canadian arctic. When a night is particularly cold---so cold in fact that you have to sleep with three dogs to keep warm, then that night is termed a three dog night. Stay tuned and I'll maybe tell you more origins from time to time.