Do women dream differently than men? Researchers from the University of Montreal plunged into the gendered unconscious in a new study forthcoming from the journal Sleep. Their focus: nightmares, defined as dreams intense and disturbing enough to wake you up. (An unpleasant reverie that doesn’t rouse you is simply a bad dream.) The study uncovered a trove of captivating facts about nightmares in general—that they prove “more bizarre” and “less rational” than regular dreams, that they don’t necessarily provoke fear. (About one-third of these nocturnal ordeals instead breed sadness, confusion, guilt, or disgust.) But of special interest to me was the discovery that nightmare themes often vary by gender.