About the Authors

Keith C. Summa

Affiliations Center for Sleep and Circadian Biology, Department of Neurobiology, Northwestern University, Evanston, Illinois, United States of America, Northwestern University Feinberg School of Medicine, Chicago, Illinois, United States of America

Martha Hotz Vitaterna

Affiliation Center for Sleep and Circadian Biology, Department of Neurobiology, Northwestern University, Evanston, Illinois, United States of America

Fred W. Turek

fturek@northwestern.edu

Affiliations Center for Sleep and Circadian Biology, Department of Neurobiology, Northwestern University, Evanston, Illinois, United States of America, Northwestern University Feinberg School of Medicine, Chicago, Illinois, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: FWT MHV. Performed the experiments: MHV KCS. Analyzed the data: MHV KCS. Wrote the paper: KCS MHV FWT.