Cardiometabolic Risk of Shiftwork

Inclusion Criteria

• •Day workers and shift workers at the University of Chicago, University of Chicago Medical Center, or another Chicago area medical center who have maintained their work schedule (at least 30 hours/week) for at least 6 months.
• •Individuals who have been shift workers for less than 10 years; body mass index \<40 kg/m2;
• •No major illness
• •No history of psychiatric, endocrine, cardiac or sleep disorders
• •Those with hypertension or dyslipidemia will be included if these conditions are controlled by a stable treatment.
• •Women taking oral contraceptive or hormonal replacement therapy will be included only if they plan to stay on a stable regimen throughout the study.
• •Age must be between 18 and 50 years