Effect of Blue Light Exposure on Mood

Mood dysregulation and suicidal ideation are closely associated with disruption of sleep and circadian rhythms. Moreover, sleep problems and circadian disruption are commonplace features of military life. Critically, specifically timed light exposure plays a powerful role in regulating mood, circadian rhythms, and sleep-wake patterns. Therefore, we propose to conduct a large-scale clinical trial on the effectiveness of morning light exposure treatment for improving sleep-wake patterns, emotional and mental health, and suicidal thoughts in military personnel.

Inclusion Criteria:Ages 18-60 yearsEnglish as primary languageAt least an 8th grade reading levelScore ≥ 5 (i.e., mild depression or greater) on the Patient Health Questionnaire 9 (PHQ-9)Exclusion Criteria:Score in non-depressed range on Patient Health Questionnaire 9 (PHQ-9) (< 5)History of psychotic disorder or manic episodesCurrent or prior history of eye diseaseHistory of migraine headachesCurrent or prior history of sleep-related breathing disordersSelf-reported use of sedative hypnotic sleep medications or melatonin supplementsSelf-reported use of prescription stimulantsSelf-reported excessive use of caffeine (i.e., > 500 mg per day)Plans to engage in nightshift work during the 8-week course of the study