Inclusion Criteria: 

• Male or female.
• 18-64 years of age.
• Body weight of 50-100 kg (110-220 lbs).
• Body mass index (BMI) of 18-32 kg/m2.
• Otherwise healthy as determined by medical evaluation that includes:
  • medical history;
  • physical examination;
  • neurological exam;
  • laboratory tests;
  • vital signs;
  • cardiac monitoring.
• History of moderate or severe alcohol use disorder (AUD) categorized based on Diagnostic and Statistical Manual of Mental Disorders Fifth Edition (DSM-5) criteria, as follows:
  • Moderate as defined by presence of 4-5 of the 11 criteria;
  • Severe as defined by the presence of ≥ 6 of the 11 criteria.
• At least 3 weeks and not more than 6 months since last alcoholic beverage intake at the time of study screening. Any subject who completed an alcohol detoxification program must be at least 7 days from completion of the program at the time of screening. 
• Persistent insomnia that emerged or worsened during AUD period, or during or after alcohol cessation characterized by a study-specific sleep diary. 
• A female participant is eligible to participate if she is not of childbearing potential. Nonsurgically sterilized males with a sexual partner of childbearing potential must be willing to use adequate and reliable contraception throughout the study.
• Willing to refrain from a behavioral or other treatment program for insomnia during participation in the study.

Exclusion Criteria: 

• Current diagnosis of a sleep-related breathing disorder including obstructive sleep apnea (with or without continuous positive airway pressure (CPAP) treatment), periodic limb movement disorder, restless legs syndrome, circadian rhythm sleep disorder or narcolepsy.
• An apnea-hypopnea index (AHI) score of > 10 or a periodic limb movement arousal index (PLMAI) score of > 15 recorded during the screening period PSG. 
• Documented history of insomnia prior to onset of the alcohol use disorder (AUD), which did not worsen during the AUD period or during or after alcohol cessation. 
• Comorbid conditions which interfere with normal sleep pattern or the evaluation of next day residual effects.
• Any lifetime history of suicidal ideation or behavior.
• History of or any current conditions that might interfere with drug absorption, distribution, metabolism, or excretion (including any surgical interventions for weight loss). 
• Any history of seizures (except related to alcohol withdrawal) or head trauma with sequelae. 
• Known history of testing positive for human immunodeficiency virus (HIV), hepatitis B surface antigen (HBsAg) or hepatitis C antibody (anti-HCV). 
• History of diagnosed, active liver disease or elevated liver enzymes/bilirubin. 
• History of kidney stones or renal insufficiency or abnormal kidney function at screening. 
• Uncontrolled hypertension (> 140 mm Hg systolic / 90 mm Hg diastolic). 
• Use of any medication that affects sleep and/or wake function during the week before starting the screening period. 
• Subjects currently undergoing treatment of other addictions in addition to alcohol. 
• Excessive caffeine consumption.
• Positive urine drug screen for prohibited substances, except for cannabis on a case-by-case basis. 
• History of drug use disorder over the past year, other than alcohol/nicotine/caffeine/cannabis. 
• Plans to travel across more than 3 time zones in the 2 weeks before screening, or during study participation.
• Night or rotating shift worker. 
• Any history and/or current evidence of other medical (eg, cardiac, respiratory, gastrointestinal, renal, malignancy other than basal cell carcinoma), neurological, or psychiatric conditions that, in the opinion of the investigator, could affect the subject's safety or interfere with the study. Other protocol-specific inclusion/exclusion criteria may apply.