Apnea and Insomnia Relief Study

Inclusion Criteria: * Veterans diagnosed with sleep apnea with Apnea Hypopnea Index of at least 5 via sleep study and recommended for PAP therapy * Meet DSM-5 Criteria for Posttraumatic Stress Disorder or subthreshold Posttraumatic Stress Disorder * Meet DSM-5 Criteria for Insomnia Disorder * Willing to attend all treatment and assessment appointments * English literacy and cognition sufficient to participate in treatment and assessment Exclusion Criteria: * Psychosis or manic episode in last 5 years * Moderate or severe substance use disorder in past 6 months * Started or ended psychotherapy for a sleep disorder or mental health diagnosis within the last 1 month or plans to discontinue this treatment during the trial * Started or ended an antidepressant, anxiolytic, or sleep medication with the last 1 month or plans to discontinue this treatment during the trial * Prominent suicidal or homicidal ideation requiring alternative treatment for patient safety * Untreated sleep disorders that may interfere with successful treatment (up to discretion of Principal Investigator) * Having travel of personal plans that would disrupt regular treatment engagement (up to discretion of Principal Investigator) * Working night shifts or rotating shifts that include night shifts * Lack of stable housing * Pregnancy