1. Department of Economics, Harvard University, Cambridge, MA, USA.
2. Division of Sleep and Circadian Disorders, Department of Medicine, Brigham and Women’s Hospital, Beth Israel Deaconess Medical Center, and Harvard Medical School, Boston, MA, USA.
3. Department of Economics, Massachusetts Institute of Technology, Cambridge, MA, USA.
4. Department of Medical Ethics and Health Policy, University of Pennsylvania, Philadelphia, PA, USA.