EFFECTS OF IMPACTFUL DREAMS 1 The Contrasting Effects of Nightmares, Existential Dreams, and Transcendent Dreams Don Kuiken University of Alberta Keywords: nightmares, existential dreams, transcendent dreams, self-perceptual depth, sublime feeling Author Note Correspondence may be addressed to Don Kuiken, Department of Psychology, University of Alberta, Edmonton, AB, Canada, T6G 2E9, email: dkuiken@ualberta.ca.