34
Jim Godfrey (vice president of global communications, Jawbone), email to the author, September 25, 2015.
35
Derickson, Dangerously Sleepy.
36
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37
Rafat Ali, «Travel Habits of Americans: 42 Percent Didn't Take Any Vacation Days in 2014,» Skift, January 5, 2015, .
38
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39
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40
Marie Soderstrom, Kerstin Jeding, Mirjam Ekstedt, Aleksander Perski, and Torbjorn Akerstedt, «Insufficient Sleep Predicts Clinical Burnout,» Journal of Occupational Health Psychology 17 (2012): 175–83.
