1. Department of Medicine, Perelman School of Medicine University of Pennsylvania Philadelphia Pennsylvania
2. Renal‐Electrolyte and Hypertension Division, Perelman School of Medicine University of Pennsylvania Philadelphia Pennsylvania
3. Sleep and Health Research Program, Department of Psychiatry University of Arizona Tucson Arizona
4. Department of Sleep Medicine Landspitali ‐ The National University Hospital of Iceland Reykjavik Iceland
5. Faculty of Medicine University of Iceland Reykjavik Iceland
6. Center for Sleep and Circadian Neurobiology University of Pennsylvania Philadelphia Pennsylvania
7. Division of Sleep Medicine, Perelman School of Medicine University of Pennsylvania Philadelphia Pennsylvania
8. Department of Medicine Corporal Michael J. Crescenz Veterans Affairs Medical Center Philadelphia Pennsylvania
9. Center for Clinical Epidemiology and Biostatistics, Perelman School of Medicine University of Pennsylvania Philadelphia Pennsylvania