A long time ago there was a god named Prometheus and his brother Nubis, also a god. Nubis' whole life was invisible. No one payed attention to him. Everything evolved around his brother. He soon became sick of it and finally felt the need to do something about it. He said aloud "You will notice me!!"
"What was that all about?" Prometheus said. "It's like no one notices me or talks to me, and i'm tired of it. You've always got everything you wanted." said Nubis. "Stop over reacting. Your being a baby." said Prometheus. Nubis stormed out the room and yelled "you haven's seen over reacting yet!"
Nubis thought of a plan to get back at Prometheus. Nubis started to bring the evil spirits out the dead to kill Prometheus' greatest creation (the humans). He would have them enter their bodies while they sleep, to relive again, and work for Nubis to take down Prometheus.
Prometheus realized the human population was going down rapidly. He realized what was happening because people were waking up and finding their family members dead and looked as if they have been drained of life. As soon as he'd been told what has been happening, he came to realize it was his brother, Nubis. Prometheus worked really hard to save all of the humans.
The spirits roaming the town doing things for Nubis saw what Prometheus was doing and went back and told Nubis that he is saving the humans. Nubis took it upon himself to go to Prometheus and confront him. Prometheus were arguing for a while and broke out into a fight. Prometheus won the fight with a lightning strike on Nubis. It didn't kill him, though Prometheus didn't want him dead because he's still his brother.
Prometheus put Nubis in a dungeon to keep him locked up and away from harming the humans. Nubis still tried to finish what he started so the remaining evil spirits still roamed the town. Prometheus but a shield over all humans so that when the spirits tried to take the livings' life they couldn't get past the surface. So that's why when we sleep we have bad dream, but as Prometheus calls them, Nightmares.