Sleep is an important factor for overall health. This study will see how different light exposure patterns and food intake impact a person's metabolism (how the body breaks down food) when sleeping is reduced.
Participants will attend 6 to 8 in-person visits to the study clinic, including three overnight stays. People will complete surveys and medical tests. The study will last about 4 to 6 months.
Age: 18-35 years old; equal numbers of men and women
Body Mass Index (BMI): 18.5-24.9 kg/m2
Sleep Habits: habitual self-reported average total sleep time (TST) 7-9 hours per night for prior 6 months
Clinically diagnosed sleep disorder or apnea hypopnea index (AHI) ≥5
Evidence of significant organ system dysfunction or disease (e.g., heart disease, diabetes)
Fasting plasma glucose ≥100 mg/dL
Major psychiatric illness (e.g., major depressive disorder)