Nightmares

 Nightmares are the primary monsters the Oneiro Rangers have to face.

Description
Nightmares have not been fully explained yet, but they are based on actual nightmares, and tend to hunt energy sources.? There is a theory that they are created by a major event in a person's life, usually with some kind of metaphorical significance.

Known Individuals

 * The Heart Stopper, a serpentine roller coaster containing a full freakish carnival inside its body.? It absorbed irregular heartbeats and fed off them, capturing people and keeping them frightened to feed itself.?  It was destroyed by Errol tricking it into crushing itself with its own chains.?  Connected to it was a clown, Zeebo, who took care of the "food" and fought Errol hand-to-hand while the Teal Ranger was inside it.
 * The Catch, a black and purple insect-like monster with blue and red fangs that sucked some kind of fluid out of unconscious people (possibly sweat combined with oil or gasoline) to regenerate itself.? Sova managed to destroy it by stabbing it through one red eye, only to discover that the creature was only a child of the main body of the Catch. ?  Another offshoot was destroyed by Glenda wielding her Oneiro Stiletto, and Sova drove the main monster and a train off a cliff into the ocean, then fought and destroyed it with his Oneiro Knife and Pistol.