The Effects of Insomnia Treatment on Overnight Regulation of Emotional Memories and Risk for Mental Disorders

Inclusion Criteria: * (A or B) and (C) A. Diagnosis of insomnia disorder (DSM-5-TR) B. Insomnia Severity Index (ISI) score ≥ 10 C. Generalized Anxiety Disorder (GAD-7) score ≥ 10 * All sexes and genders. * Between 18 and 45 years of age. * Able to provide informed consent. * Proficient in English. Exclusion Criteria: x Sleep or circadian disorder other than insomnia (e.g., hypersomnolence, periodic limb movement disorder, advanced or delayed sleep phase disorder, moderate to severe sleep apnoea disorder based on previous sleep study with an apnea-hypopnea index ≥ 15 and/or finger-pulse oximetry oxygen desaturation index (ODI) ≥ 10). * Current or history of neurological disorders (e.g., stroke, brain injury). * Current or history of bipolar disorder, psychosis, or moderate to severe obsessive-compulsive disorder. * Current uncontrolled mental health disorders requiring specialist care, other than major depression and anxiety disorders. * Centrally active agents or presence of medical condition that may affect participation. * Pregnancy or actively trying to conceive, or lactating. * Shift work for at least 2 shifts per week in the past 3 months (i.e., work between 21:00 and 6:00). * Travel across time zones over 3 hours difference in the previous 30 days (will require a 1-day adjustment period per hour of time zone travelled). * Unwilling to know about potential incidental findings. * No consent or adherence to instructions for any part of the study protocol.