Agapi Stassinopoulos, conversation with the author, June 23, 2015.

Nathaniel F. Watson, M. Safwan Badr, Gregory Belenky, Donald L. Bliwise, Orfeu M. Buxton, Daniel Buysse, David F. Dinges, James Gangwisch, Michael A. Grandner, Clete Kushida, Raman K. Malhotra, Jennifer L. Martin, Sanjay R. Patel, Stuart F. Quan, and Esra Tasali, «Joint Consensus Statement of the American Academy of Sleep Medicine and Sleep Research Statement on the Recommended Amount of Sleep for a Healthy Adult: Methodology and Discussion,» SLEEP 38 (2015): 1161–83.