Did you know that you actually can never forget a face?

Every single face that you've ever seen during your life gets stored into your memories, and gets used up later. For example, in dreams, your brain can't create a face. Every single face you've seen in your dream, you've seen somewhere once in your life.

And those strange nightmares you've had of those terrible demon-like creatures?

You've seen them around too, you simply can't remember. You don't want to remember.