Adapted CBT-I for Adolescents With Insomnia : The DREAM-IT Study

The goal of this study is to test an adapted treatment for teen insomnia in comparison to a waitlist condition. Cognitive Behavioral Therapy for Insomnia (CBT-I) is an intervention that was developed for adults and is sometimes also used for teens. Teens, parents, and health care providers helped to review and adapt CBT-I to form Teen CBT-I. Teen CBT-I includes most of the same content as CBT-I, with some changes to match teen biology and lifestyles. The main questions this clinical trial aims to answer are: * Does Teen CBT-I improve insomnia symptoms in teens? o Researchers will compare Teen CBT-I to the waitlist control condition to see if insomnia symptoms significantly improve in the treatment group. * Do teens and their parents find Teen CBT-I to be acceptable? o Researchers will examine Teen CBT-I acceptability ratings. Teen CBT-I is hypothesized to improve insomnia symptoms in teens, and teens and parents are hypothesized to find Teen CBT-I to be acceptable. Teen participants will be randomized to one of the two conditions: Teen CBT-I treatment or waitlist control. They will also complete assessments at three timepoints: Baseline (before treatment); post-intervention (after treatment); and follow-up (2 months after treatment). For each assessment, teen participants will: * Fill out questionnaires about their sleep, mood, and other areas * Keep daily sleep logs for one week * Wear an actigraph, a wrist-watch like device that records activity levels to determine sleep-wake patterns, for one week. Parent participants will also be asked to complete questionnaires at each measurement point about their teen's sleep, mood, and other areas. The intervention conditions are: * Teen CBT-I includes 4-6 one-hour individual virtual sessions with a therapist. It includes standard CBT-I content with some small changes to match teen biology and lifestyles. The main parts of this treatment include healthy sleep habits, only using the bed for sleep, keeping a recommended sleep schedule, changing negative thoughts about sleep, and learning ways to relax the mind and body for sleep. * Waitlist-control, in which teens will not receive any treatment for 8 weeks. After the second assessment, they will receive free access to an app-based CBT-I treatment which they can complete on their own.