You know, like bats

An actual conversation we had in the car on Friday night:

Sara: "Nanci, do you like witches?"

Nanci: Well Sara, I don't think I know any witches.

Sara: "Oh."

Nanci: When do you see witches?

Sara: At night. You know, they're nocturnal. Like bats.

[Long pause, while we process this newfound vocabulary]

Nanci: Sara, what does nocturnal mean?

Sara: You know, nocturnal - they sleep all day and play all night!

I have no idea.