Sleep researchers estimate that nearly three quarters of our dream emotions are negative. But what do nightmares actually mean? Guests discuss the science behind nightmares and shed light onto the murky field of dream interpretation and analysis.
Natalie Angier, science writer for The New York Times and author of "In the Dreamscape of Nightmares, Clues to Why We Dream at All"
Kelly Bulkeley, dream researcher, visiting scholar at the Graduate Theological Union in Berkeley and faculty member of the Dream Studies Program at John F. Kennedy University