You should never sit up late at night reading a scary book, especially not one you know will escalate from "spooky" to "gruesome" to "utterly horrifying," without relent.
You shouldn't do this after a day when you've just rushed your cat to the emergency clinic. Then, later in the evening, you shouldn't read the book immediately before and after your cat does something gory and grotesque.
None of this should happen when you're recovering from a bad cold, when you have a slight cough that threatens to keep you awake anyway.
Downstairs, Zsa Zsa is keeping silent watch over the kitchen vent, hoping for more mice.
There is no way I'm going to fall asleep. This is a much needed Gravol night.