A couple of months ago, my son developed an intense fear of unknown noises. Thunder. Clanks. Cars outside that he couldn't see. The scene in "Cars" where Lightning McQueen scares the tractor-cows.
For the longest time I thought it was all bogus, that someone had made him think he was afraid of those sounds by asking him if he was afraid of them.
Then he started telling us that he heard sounds at night, so we told him to talk to his monkey (who sleeps with him) whenever he heard the scary sounds. He tells me nightly that Monkey makes the noises go away, and it's just become part of our routine.
I thought my boy was getting kind of soft. Not any more. I hear the noise, and it's creepy as shit. And I can't find where it's coming from. But it's definitely in his room.