1. Alpert Medical School of Brown University, Department of Psychiatry and Human Behavior, Providence, RI
2. E.P. Bradley Hospital, Sleep for Science Laboratory, Providence, RI
3. University of North Texas Health Science Center, Department of Internal Medicine, Fort Worth, TX
4. Mental Health and Behavioral Sciences Service, Department of Veterans Affairs Medical Center, Providence, RI
5. Department of Behavioral and Social Sciences and Center for Alcohol and Addiction Studies, Brown University, Providence, RI