Per wiki policy, Spoilers Off applies here and all spoilers are unmarked. You Have Been Warned.

Sleep tight.

General

Simply invoking the Easter Egg won't keep you safe. Leaving any of the first three games idle for about 5 minutes results in "screensavers" appearing that are creepily Painting the Medium.
The doll scares in all the games. The Manor of Sleep has a doll next to a regenerating Type-14 Film spot. Looking at the doll through the camera causes it to look back at you. Something similar occurs with a mannequin in Kageri's room in the fourth game. Except she quickly moves her head back, pretending she didn't do anything.
It is disturbing that some of these sacrifices actually WANTED to be sacrificed. While some do out of their sense of duty, some of them are shown to be a little too enthusiastic to be sacrificed which usually entails a lot of pain and suffering.