I really enjoyed the Nightmare series.
When you fall asleep, an ugly-looking monster called Freddy appears in your dreams and tries to kill you, but this is the story of being killed or suffering in reality.
There was a time when I was so scared when I was young that I couldn't sleep for two days. If I fall asleep, the real Freddy will appear...

“One two, Freddy is coming.
Three, four, lock the door.
Six six, the cross on the chest.
seven eight, stay up late
Nine ten, do not sleep.”

Even now, as an adult, thinking about it is terrifying.