All authors have completed and submitted the International Committee of Medical Journal Editors form for disclosure of potential conflicts of interest. Mark É. Czeisler reports grants from Australian-American Fulbright Commission administered through a 2020 Fulbright Future Scholarship funded by the Kinghorn Family Foundation and personal fees from Vanda Pharmaceuticals. Mark E. Howard reports grants from Institute for Breathing and Sleep, Austin Health. Rebecca Robbins reports grants from the National, Heart, Lung, and Blood Institute and personal fees from Rituals Cosmetics, Denihan Hospitality, and ASYSTEM. Laura Barger reports grants from the National Institute of Occupational Safety and Health and personal fees from University of Pittsburgh, CurAegis, Casis, Puget Sound Pilots, Boston Children's Hospital, and Charles A. Czeisler. Elise R. Facer-Childs reports grants from Science and Industry Endowment Fund Ross Metcalf STEM+ Business Fellowship administered by the Commonwealth Scientific and Industrial Research Organization, the Turner Institute for Brain and Mental Health, Monash University, and research support or consultancy fees from Team Focus Ltd, British Athletes, Australian National Rugby League, Henley Business School, Collingwood Football Club and St Kilda Football Club. Shantha M. W. Rajaratnam reports grants from Turner Institute for Brain and Mental Health, Monash University; grants and personal fees from Cooperative Research Centre for Alertness, Safety and Productivity and grants or fees to Monash University from Vanda Pharmaceuticals, Teva Pharmaceuticals, BHP Billiton, and Herbert Smith Freehills; and other from Qualtrics. Charles A. Czeisler reports an endowed professorship to Harvard from Cephalon, Inc., research support to Harvard Medical School from Philips Respironics Inc. and grants from the National Institute of Occupational Safety and Health; grants and personal fees from Teva Pharmaceuticals Industries Ltd, personal fees and other from Vanda Pharmaceuticals Inc, personal fees from Teva Pharma Australia; and has a patent on Actiwatch-2 and Actiwatch-Spectrum devices with royalties paid to Philips Respironics Inc. Charles A. Czeisler's interests were reviewed and managed by Brigham and Women's Hospital and Partners HealthCare in accordance with their conflict of interest policies. Charles A. Czeisler served as a voluntary board member for the Institute for Experimental Psychiatry Research Foundation, Inc. No other potential conflicts of interest were disclosed.