Influence of Nocturnal Light Exposure on the Impairment of Glucose Tolerance Induced by Chronic Sleep Restriction

Inclusion Criteria: * Healthy adults with conventional and regular sleep-wake timing * Non-smokers * Completion of medical, psychological, and sleep screening tests * Able to spend 33 consecutive days/nights in the laboratory * Normal color vision 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 * 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 3 years * Hearing impairment, visual impairment * History of eye trauma or surgery * Drug or alcohol dependency