About the Authors

Mark R. Smith

Affiliation Biological Rhythms Research Laboratory, Department of Behavioral Sciences, Rush University Medical Center, Chicago, Illinois, United States of America

Helen J. Burgess

Affiliation Biological Rhythms Research Laboratory, Department of Behavioral Sciences, Rush University Medical Center, Chicago, Illinois, United States of America

Louis F. Fogg

Affiliation Biological Rhythms Research Laboratory, Department of Behavioral Sciences, Rush University Medical Center, Chicago, Illinois, United States of America

Charmane I. Eastman

ceastman@rush.edu

Affiliation Biological Rhythms Research Laboratory, Department of Behavioral Sciences, Rush University Medical Center, Chicago, Illinois, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: MRS HJB CE. Performed the experiments: MRS HJB. Analyzed the data: MRS LFF. Wrote the paper: MRS HJB LFF CE.