From Trauma to Suicidality: The Mediating Role of Sleep Disturbances—Evidenced from a Narrative Mini-Review

Traumatic experiences are among the strongest predictors of suicidal thoughts and behaviors, but the mechanisms that account for this association are still debated. Sleep disturbances, particularly insomnia, nightmares, and fragmented sleep, are highly prevalent after trauma and have been shown to predict suicidality independently of depression and other psychiatric comorbidities. This narrative mini-review synthesizes evidence from epidemiological, clinical, and experimental studies to examine whether sleep may represent a pathway linking trauma and suicidality. Among the proposed mechanisms, alterations in REM sleep regulation, dysregulation of the hypothalamic–pituitary–adrenal axis, and impaired prefrontal control of emotional reactivity have received empirical support, although findings remain inconsistent across populations. Importantly, trauma-related nightmares and persistent insomnia appear to be especially strong markers of elevated suicide risk. Clinically, these observations suggest that routine sleep assessment could add value to suicide risk evaluation in trauma-exposed individuals. Interventions such as cognitive behavioral therapy for insomnia, imagery rehearsal therapy, and REM-modulating pharmacological treatments have shown promise, but their specific impact on suicidality requires further testing in controlled trials. Future research should prioritize longitudinal designs, incorporate both subjective and objective sleep measures, and include culturally diverse samples to clarify causal mechanisms and refine prevention strategies.