Author Contributions: Dr Leproult had full access to all of the data in the study and takes responsibility for the integrity of the data and the accuracy of the data analysis.
Study concept and design: Leproult, Van Cauter.
Acquisition of data: Leproult, Van Cauter.
Analysis and interpretation of data: Leproult, Van Cauter.
Drafting of the manuscript: Leproult, Van Cauter.
Critical revision of the manuscript for important intellectual content: Leproult, Van Cauter.
Statistical analysis: Leproult, Van Cauter.
Obtained funding: Van Cauter.
Conflict of Interest Disclosures: Both authors have completed and submitted the ICMJE Form for Disclosure of Potential Conflicts of Interest and none were reported.
Funding/Support: This work was supported by the National Heart, Lung, and Blood Institute grant 5R01HL72694-5, by the National Institute of Diabetes and Digestive and Kidney Diseases grant P60DK-020595, and by the National Institutes of Health grant MO1-RR-00055.
Role of the Sponsor: The funding agencies had no role in the design and conduct of the study; in the collection, analysis, and interpretation of the data; or in the preparation, review, or approval of the manuscript.
Additional Contributions: We thank the volunteers who participated in this demanding study and the research and technical staff of the Clinical Resource Center, the Diabetes Research and Training Center, and the Sleep Research Laboratory at the University of Chicago. Volunteers were compensated for their participation; staff members were not compensated outside of their salaries.