Prospective associations of insomnia and nightmares with suicidal behavior among primary care patients.

INTRODUCTION: Insomnia and nightmares have both been associated with suicide risk and are both known to be commonly reported in a primary care setting. However, we are unaware of any studies examining the sleep-suicide relationship in the primary care setting. Clarifying these relationships could reveal important clues for improving suicide prevention efforts in primary care and other medical settings.

METHOD: Participants included 2,744 primary care patients recruited from six clinics located at five U.S. military installations. Participants completed measures of suicidal ideation, insomnia, and nightmares at baseline and suicidal ideation and suicide attempts were tracked at 6- and 12-month follow-up interviews.

RESULTS: Of the 1,792 patients with follow-up data, 57 (3.2%) attempted suicide during the 12-month follow-up. Patients who attempted suicide during follow-up were more likely than patients who did not attempt suicide to have clinical insomnia and nightmares at least weekly. When adjusting for baseline suicidal ideation, clinical insomnia and nightmares at least weekly remained significant predictors of follow-up suicide attempts.

CONCLUSIONS: Our findings suggest that insomnia and nightmares are accurate predictors of subsequent suicidal behavior among a primary care population and may offer positive predictive value for suicidal behavior over and above what can be provided by assessing suicidal ideation alone. (PsycInfo Database Record (c) 2026 APA, all rights reserved).