Existing somewhere between boogeyman, scapegoat, and temperamental fae, the known trickster called Púca is an animal-spirit that was once dreaded across Ireland, the Channel Islands, and England.

Go back to a time before the invention of artificial light and experience a world petrified in the pitch of darkness...when fear ruled the night.

Brain surgeon and neuroscientist Dr. Rahul Jandial joins TODAY to talk about why people dream and have nightmares, what they could mean and how people can change their nighttime images.

We still have nightmares from these 90s commercials. Welcome to WatchMojo, and today we’re ranking the 1990s television adverts that forever haunt our dreams. Our countdown includes Dogman, the Slim Jim Man, Plug Me into a Sega, and more!

Nightmares. We all have them. But what exactly do they mean? Why do we have bad dreams? Is there any psychological meaning behind them? Nightmares are the source of much of the horror we see in stories, myths, movies and games.

Will you wake up from this nightmare?