Plain-language definitions grounded in the clinical and regulatory literature.
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Disorder
What it isMilitary Sexual Trauma (MST) is the VA’s term for sexual assault or repeated threatening sexual harassment experienced during military service. Reported by approximately 1 in 4 women veterans, MST is the strongest predictor of PTSD in the women veteran population.
Why it mattersMST drives the most prevalent sleep disorders in women veterans — insomnia disorder and nightmare disorder — through PTSD-mediated HPA-LC sensitization. Veterans with MST are 7.25 times more likely to develop PTSD, which in turn produces chronic sleep disruption that often outlasts PTSD treatment.
Think of it like thisMST is not merely a traumatic event but a relational wound in an institutional context: it involves betrayal by the system responsible for the service member’s safety, creating a second layer of distrust that persists when that same system is expected to provide care.
Under 38 CFR 17.383, MST includes sexual assault and sexual harassment during military service. The VA screens all veterans for MST at enrollment. MST does not require in-service documentation for VA treatment eligibility — a veteran’s report to a VA provider is sufficient. MST coordinators are designated at all VA facilities to facilitate care pathways.
MechanismMST produces PTSD through HPA-LC hyperactivation: amygdala sensitization, elevated cortisol and norepinephrine, impaired prefrontal cortex regulation. The distinguishing feature is institutional betrayal trauma — the perpetrator’s embeddedness in the institutional context creates additional trust-related barriers affecting both disclosure and treatment engagement. This is why MST-related sleep disorders require trauma-informed care at every clinical encounter.
Scientific ConsensusMST survivors are 7.25x more likely to develop PTSD (Kelly 2021). Travis et al. 2024 found MST independently predicted clinically significant insomnia (OR 3.18) in midlife women veterans. CPT for MST-related PTSD leaves 89% with clinically significant sleep disturbance at post-treatment (Levy 2019). Concurrent sleep-specific treatment (CBT-I, IRT) alongside trauma-focused therapy is required, not sequential.
Sleep disorders, PTSD, and the invisible wounds of service can feel isolating. If you or someone you know is in crisis or experiencing thoughts of self-harm, help is available right now. The Veterans Crisis Line provides free, confidential support 24 hours a day, 7 days a week to veterans, service members, and their families.
If you are in crisis or experiencing thoughts of self-harm, call the Veterans Crisis Line at