RecruitingDevice studySleep and Emotion Processing in Adolescent Post-traumatic Stress DisorderThe goal of this clinical trial is to characterize the role of sleep, emotion processing, and daily affect in post-traumatic stress disorder (PTSD) and whether improving sleep quality using slow wave activity enhancement will impact next-day affect in youth. Participants will attend 4 study visits: * A clinical and trauma assessment visit * A testing day that may include cognitive testing, surveys, and an MRI. * An overnight sleep study following one week of at-home sleep recordings with the device in the sham condition * An overnight sleep study following one week of at-home sleep recordings with the device in the sleep enhancement condition