Adjunctive Bright Light Therapy for Opioid Use Disorder

Inclusion Criteria: * age between 18 and 65 * ability to speak, write, and read in English * past 2 weeks of insomnia as evidenced by Insomnia Severity Index (ISI) total score of ≥10 * enrolled in outpatient medication-assisted treatment for OUD (i.e., either methadone or buprenorphine treatment) * been in medication-assisted treatment for at least 3 months * at least one month of stable methadone or buprenorphine dose * have a smartphone Exclusion Criteria: * lifetime history of bipolar disorder or mania * current narcolepsy, sleep paralysis, or restless leg syndrome as assessed by medical history * history of seizure disorders/epilepsy * the STOP-Bang score for obstructive sleep apnea ≥ 5 * retinal pathology, history of eye surgery or taking photosensitizing medications (e.g., lithium, L-tryptophan) * current regular use of melatonin * have circumstances that would interfere with study participation (e.g., impending jail sentence) * previous experience with bright light therapy * working a night shift or traveling outside the Arizona time zone in the past month * pregnant, trying to get pregnant, or breastfeeding * currently wearing prescription glasses with blue-light protection