Thanks for your reply! No, the sanity doesn't drop randomly, that is because of the ghoul in the area of the kitchen. Usually, it comes more or less directly into the hallway, but maybe it didn't in your case. That is one of the central game play loops in the game - as long as you don't know anything about the monsters, they drive you insane. Only if you learned something about them - in this case, it is enough to read the book in the study room - you are able to confront them physically. Developing the realtime enemies took me a lot of time, as it wasn't part of my crawler kit, so the game fell short there.