1. Healthy, non-smoking men or women between 21 and 65 years inclusive; 2. Good general health as determined by a thorough medical history and physical examination including vital signs; 3. Subject is a self-reported moderate drinker of alcohol, typically consuming 2 to 7 units of alcohol. Moderate drinking can be approximated with a BAC of 0.04 - 0.11%. The 0.04% - 0.11% BAC correlates approximately with a 120-160 pound female drinking 2 to 5 drinks in 2 to 3 hours, respectively, and a 160-200 pound male drinking 3 to 7 drinks in 2 to 3 hours, respectively; 4. Subject has prequalified as likely hangover-sensitive based on pre-study questionnaire; 5. Body mass index between 19 and 32 kg/m2, inclusive ; 6. Report a regular, habitual bedtime between 21:30 and 24:00; 7. Females of childbearing potential must have a negative urine pregnancy test at screening and upon admission for each treatment visit and be using an acceptable method of contraception (see Section 8.5); 8. Subject is capable of understanding the requirements of the study and to give written informed consent; 9. Subject is able to follow study instructions and is willing to complete all study visits and procedures.