A Pilot Study of Digital Cognitive Behavioral Therapy for Veterans

Inclusion Criteria: Participants must be: * at least 18 years of age (no upper age limit) * meet DSM-5 defined criteria for insomnia disorder * be on a stable dose of any prescription medication (including sleep medication) for at least 2 weeks prior to the in-person screening assessment * have comorbid psychopathology (i.e., symptoms of Posttraumatic Stress Disorder (PTSD), anxiety, and/or depression) Exclusion Criteria: * limited mental competency (not oriented to person, place, or time) and the inability to give informed, voluntary, or written consent to participate * high risk for sleep apnea (STOP-Bang score \>/= 3) * current or previous diagnosis of sleep apnea that is untreated * history of moderate or severe Traumatic Brain Injury * current substance or alcohol use disorder, moderate to severe, in the past 3 months * current bipolar disorder * current or lifetime psychotic disorders * seizure disorders * moderate to high risk of suicide in the past month