Narcolepsy Nightmare Study

The goal of this clinical trial is to test two behavioral treatments for nightmares in adults with narcolepsy. The main questions it aims to answer are: * Is imagery rehearsal therapy (IRT) effective for narcolepsy-related nightmares? * Does adding targeted dream control (TDC) to IRT make it more effective? Participants will be randomized to one of two treatment groups and will be asked to: * Complete a daily log of sleep symptoms for up to 13 weeks. * Attend 7 sessions of treatment. * Complete questionnaires before and after treatment. * Go to the research lab in Evanston, IL to complete a sleep study during a daytime nap (Chicago area residents only).