Evaluation of Sex Differences in Glucose Metabolism in Response to Sleep Curtailment

Inclusion Criteria: * Healthy adults with conventional sleep-wake timing * Non-smokers * Completion of medical, psychological, and sleep screening tests * Able to spend 5 consecutive days/nights in the laboratory on two separate occasions (total of 10 days/nights in the laboratory) * Women must have a recent history of regular menstrual cycles Exclusion Criteria: * History of neurological or psychiatric disorder * History of sleep disorder or regular use of sleep-promoting medication * Current prescription, herbal, or over-the-counter medication use including hormonal birth control * Traveling across 2 or more time zones within past 3 months * Donating blood within past 8 weeks * Worked night or rotating shift work within past year * Hearing impairment, visual impairment * History of eye trauma or surgery * Drug or alcohol dependency