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Finding medication treatment that improves sleep disturbances with posttraumatic stress disorder (PTSD) has challenged the field of psychopharmacology with debate regarding the desirable profile of effects on sleep physiology. Evidence for fragmentation of REM sleep during the earlier stages of PTSD drew our interest to the first marketed dual orexin antagonist, suvorexant, which has been suggested in some studies to enhance REM sleep. This property has also raised concerns regarding potential exacerbation of nightmares and REM sleep related parasomnias. Insomnia is a common sequela of trauma exposure and can occur with and without other PTSD symptoms. The objective of our study was to evaluate the tolerability and preliminary efficacy of suvorexant for trauma related insomnia in a double blind, placebo controlled trial. Methods 64 met initial inclusion criteria and 42 participants had evaluable results. 65% were female, and 66% African-American, mean age was 35yrs.All participants were screened by the Duke Sleep Disorders Interview to met criteria for insomnia that began or was exacerbated following a DSM5 Criterion A trauma. Approximately a third of the study group met criteria for either current PTSD, past (remitted PTSD), or no PTSD, and 56% reported histories of traumatic nightmares hat generally had diminished from their initial severity. Results Medication intolerance was infrequent with one participant in the med group reporting mild sedation that precluded a dose increase to 20mg, and another, moderate sedation with feelings of derealization that led to discontinuation. There was no evidence for emerging nightmare symptoms or REM-related parasomnias. Overall there was significant improvement in sleep and PTSD symptoms in both the placebo and med group and a modest rise in REM sleep in the med group that did not differentiate statistically from placebo. Conclusion Our findings suggest that distressing trauma related insomnia can occur with and without PTSD and that suvorexant is well tolerated in this population. A larger and more symptomatic group is required to more definitively evaluate efficacy. Support (if any) supported by a grant from Merck (MISP 53678)

736 Evaluation of suvorexant for trauma-related insomnia