I was wondering if we can somehow use science to explain how a creature that devours dreams and nightmares might have came about.
Well it seems that dreams are images, ideas, emotions and sensations, nightmares are dreams that invoke a strong sense of negative emotions like fear and despair.
In order to ensure a constant food source, the creature would possibly also require a way to make people experienced nightmares and to dream about stuff. [It seems that 75% of dreams are nightmares anyway]
How would the creature go around achieving this?
How would such a creature have came about to exist?