Nightmares can be juxtaposed with daydreams.
Italian exotic cars are the daydreams of much of the world.
She imagined that this was the beginning of a courtship, and began to build daydreams about becoming his principal wife, but he took no further notice of her and passed on.
Some daydreams become "real" as children begin to act them out in stories and plays.
I had many manic daydreams of being a teacher who had numerous friends.