Sleep drug shows promise for dual diagnosis of alcoholism and PTSD

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * Age between 21 and 65. * Meet current (i.e., past 12-month at Day -7/-6) DSM-5 diagnostic criteria for moderate or severe AUD as determined by the MINI. * Currently experiencing PTSD symptoms at screening (Day -7/-6) as indicated by PCL-5 cut-score \> 30. * Intrinsic motivation to reduce or quit drinking (defined as self-reported intention at screening to reduce or quit drinking within the next 6 months) and to receive PTSD treatment. * Must have an ISI score equal to or \> 7 (subthreshold insomnia). ISI score below 7 at screening will not be included or proceed beyond the screening day. * Agree to abstain from all other sleep medications (starting at Day -7). * Have a place to live in the 2 weeks prior to randomization (Day 0) and not be at risk that s/he will lose his/her housing in the next month. Exclusion Criteria: * A current (past 12-month at Day -7/-6) DSM-5 diagnosis via the MINI of substance use disorder for any substances other than alcohol, nicotine, or marijuana (\< moderate level on DSM 5). * A lifetime DSM-5 diagnosis via the MINI of schizophrenia, bipolar disorder, or psychotic disorder. * Positive urine test for any recreational drugs other than marijuana at screening (Day -7/-6). * Current clinically significant alcohol withdrawal (i.e., score ≥ 10 on the CIWA-Ar). * Currently pregnant, nursing, or no reliable method of birth control (females only). * Any clinically significant medical condition that would preclude safe participation in the study (e.g. narcolepsy, seizure disorder, or other clinically significant cardiovascular, hematologic, hepatic, renal, neurological, or endocrine disorders). * Use of suvorexant (within 30 days of Day -7). * Currently on prescription medication that contraindicates use of suvorexant (including moderate or strong Cytochrome P450 3A modulators (CYP3A inhibitors and inducers)) * Hepatic insufficiency (AST/ALT \> 5x upper limit of normal (ULN)). * Suicidal Ideation determined by greater than moderate Columbia Suicide Severity Rating Scale. * Inability to provide evidence of 48-hour alcohol abstinence (self-report, BrAC, EtG) at Day 0 AND failure after second attempt at 48-hour abstinence.