Inclusion Criteria:  18-25 years of age Report ≥ 4 heavy drinking occasions in the past 28 days Report Alcohol Use Disorders Identification Test- Consumption (AUDIT-C) scores indictive of risk of drinking harm English Speaking Have a personal smartphone  Exclusion Criteria:  Sleep Disorder History Night/ Rotating work shift Travel two or more time zones in the month prior to the study or anticipated travel two or more times during study participation Clinically severe AUD in past 12 months Currently enrolled in alcohol or sleep treatment Current, severe psychiatric illness Current DSM-V substance use disorder Positive urine drug screen for a substance other than marijuana