1. Division of Sleep Medicine, Department of Medicine and
2. Center for Sleep and Circadian Neurobiology, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania
3. VA Boston Healthcare System, Boston, Massachusetts
4. Department of Medicine, Brigham and Women’s Hospital, Boston, Massachusetts
5. Division of Sleep Medicine, Harvard Medical School, Boston, Massachusetts; and
6. University of Pennsylvania School of Nursing, Philadelphia, Pennsylvania