I remember when I was young, one day I woke up to my mom seeming very worried, saying: Are you okay?! I was a bit confused here... I asked what... What is wrong? (My mom has alwas been a superstitious one) She then replied: Did the falcon man hurt you?! Or did he just stare?!
I stated that I honestly had no idea of what she was talking about...
And so she explained that during the night, I had woken up, screaming about a Monster in my room, Stating that it was a falcon man, wearing a boulder hat and a trench coat.
I, to this day, have no memory of this.
A few years later, I simply concluded that she dreampt the whole senario, as my brother did not even remember any noise.
I suppose I'll take a guess and say it's some hard-wired code in the brain.