Lemborexant Augmentation of Naltrexone for Alcohol Craving and Sleep

Inclusion Criteria: * Admission to The Menninger clinic * Age 18-65 years * diagnosis of alcohol use disorder using the DSM-5 criteria confirmed with SCID-5 and * Diagnosis of insomnia using the DSM 5 criteria, confirmed with SCID-5 Exclusion Criteria: * unstable medical conditions (e.g. liver enzymes (ALT and AST) more than 3 times normal) * acute alcohol withdrawal * another drug use disorder other than nicotine and cannabis * use of either of the study medications, naltrexone or lemborexant, within the last 30 days * Use of any opioid medication within the past 10 days * Use of scheduled benzodiazepines and hypnotics * Breathalyzer positive for alcohol * Known sensitivity to naltrexone or lemborexant * Pregnant or breastfeeding * Diagnosis of narcolepsy. The presence of other psychiatric illnesses, use of other psychotropic medications, and stable medical conditions will not be excluded.