too much blood

There's a passage in Reginald that introduces the title character's unfriendly neighbors, including an old frog, a hungry jaguar, a crazy ape, and a family of vampire bats. The bats are described as being particularly loud and unruly when they've drunk an excess of blood.

I was told, recently, that one young reader of Reginald, upon hearing her baby sister's wails, turned to her dad and said, "I think she's had too much blood to drink."