Neurobehavioral Changes Following Spaceflight Stressors

Inclusion Criteria: * Age between 25-60 years. * Free of psychological, psychiatric or physical conditions that preclude participation. * BMI between 18.5 and 35. * Self-reported regular sleep schedule; able to maintain their sleep schedule during the course of the study. * Self-reported sleep duration of 6-8.5 h per night (verified by daily logs). * Ability to read/write English. * Able to stand unassisted for up to 10 minutes at a time and able to lift arms above head. Exclusion Criteria: * Alcohol or drug abuse in the past year based upon history and urine toxicology screen. * Potential alcohol abuse or heavy drinking in the past year, based on self-report (AUDIT-C Q2 score above 1 or Q3 score above 2). * Alcohol-naive based on self-report (AUDIT-C Q1 score of 0). * Allergies, conditions or circumstances that preclude alcohol consumption, including use of medication or supplements (prescription or over the counter) that could interfere with study participation or make it hazardous for a subject to partake (e.g., anticholinergics; antipsychotics; lithium; psychotropic drugs not otherwise specified), or for which alcohol consumption should be limited or avoided (e.g. items identified on NIAAA's 'Harmful Interactions' list). * Cultural or personal beliefs that preclude alcohol consumption. * Body Mass Index ≤18.5 or ≥ 35. * Current smoker/tobacco user or using nicotine replacement therapy. Those that have been nicotine-free for ≥ 30 days may be included. * Excessive caffei…