Why do we say 'slept like a baby'? Babies wake up every two hours crying.

I want to sleep like my cat. 14 hours, no responsibilities, zero regrets.

@Natasha_Jay maybe sleep like a child? My 4-year-old sleeps so deeply (for 12 hours) that even the loudest noises - I.e. explosive thunderstorms - do not wake her up
@_elena similarly lucky with our 2yo.: once asleep, she could probably sleep through a nuclear war.
@dryak 😂❤️