A character, usually a hero, is knocked out or goes to sleep and wakes up in their own personal paradise. Whatever they wanted most, all their life, is finally theirs. Actually, they're being held prisoner by another character, usually but not always a villain, who is using something; a machine, a Platonic Cave, or other Phlebotinum to cause very intense and very realistic hallucinations. Sometimes they don't know it's all fake. Sometimes they do know but don't care. In order to escape, the hero has to break the masquerade and give up their life's dream. If they're in too deep, friends hoping to mount an Orphean Rescue have to force the hero to Battle in the Center of the Mind in order to escape. More often than not, a Dream Apocalypse occurs.