Somewhere along the line the phrase "sleep like a baby" came to mean that one had gotten a great nights sleep. When you were a guest at someone's house they would inevitably ask you in the morning "How did you sleep?" "Oh great, I slept like a baby," is the ready made answer. This does not make a bit of sense. Truly "sleeping like a baby" means that you wake up every three hours crying because you are hungry and you have pooped in your diaper. I hope I never "sleep like a baby" again.