I know this sounds stupid, but I think something is living inside my wall.
I've been hearing scratching every night around 2–3 AM. Not rats. It sounds like something dragging its nails across the inside of the wall.
I knocked on the wall and it stopped.
Then it knocked back.
Three times.
I'm probably just tired it all happend yesterday and I felt asleep.
I will update new information today if something happens.
