Orexin Receptor Antagonism and Sleep in Stimulant Use Disorder

Inclusion Criteria: * Meet Diagnostic and Statistical Manual of Mental Disorders(DSM-5)criteria for primary stimulant use disorder (either cocaine or methamphetamine) * Be fluent in English and able to understand the consent form Exclusion Criteria: * Have an opioid use disorder of any severity * Have a greater than moderate substance use disorder on any other substance * Undergoing medication-assisted treatment for withdrawal of any substance * Have any medical conditions contraindicating SUVO (e.g., severe pulmonary disease, severe cardiovascular disease or clinically abnormal ECG, severe liver or kidney disease, seizure disorder, or sleep disorder -particularly narcolepsy) * Are currently taking medications with known drug interactions with SUVO (e.g., Monoamine oxidase (MAO) inhibitors, anticonvulsants, haloperidol, phenothiazines, anesthetics, and any sedative) * Are pregnant or breast feeding * BMI \> 30 (women only) * Have a current DSM-5 psychiatric disorder or neurological disease requiring on-going treatment that would make participation unsafe * Have history of seizure disorder * Have a head injury with loss of consciousness in the last 5 years