The purpose of this research study is to see how the timing of eating impacts participants sleep and how the body responds to sugar.

This research study is aimed to answer how the timing of eating impacts participants sleep and how the body responds to sugar. Participants must be healthy and between the ages of 18-65 to join . This research study will take 2 weeks of outpatient monitoring, and 2 different nights staying in the Sleep and Metabolism Lab. There are some risks to participating in this study, like hunger, skin irritation, discomfort with blood draws, and uncomfortableness while being observed. The investigators hope that this research will benefit the knowledge learned about circadian rhythms and metabolic disease and how the timing of eating affects these things.

Inclusion Criteria:

• Healthy adult men and women ages 18-65
• habitual sleep duration between 7-9.25 hours
• lived at altitude for at least 3 months.

Exclusion Criteria:

• Diagnosed acute or chronic physical or psychiatric disorders;
• diagnosed sleep disorders;
• not participating in another research study concurrently which could increase risks, such as those involving medication or blood sampling;
• shiftwork in the 6 months before the study; travel more then one time zone three weeks prior to the study;
• blood donation 30 days prior to the first study visit;
• illicit drug use, prescribed medication use (excluding over the counter products) 30 days prior to the study visit;
• everyday nicotine use;
• regular consumption of over 400mg caffeine per day in the past month; and consumption of over 14 alcoholic beverages a week, or more than 4 alcoholic beverages in a single day over the past month for men and consumption of over 7 alcoholic beverages a week, or more than 3 alcoholic beverages in a single day over the past month for women.

IPD will be shared upon reasonable request to the PI, Dr. Josiane Broussard