According to Alex Soojung-Kim Pang in an excerpt from his book “REST: Why You Get More Done When You Work Less“
For all the attention the Berlin conservatory study has received, this part of the top students’ experiences—their sleep patterns, their attention to leisure, their cultivation of deliberate rest as a necessary complement of demanding, deliberate practice—goes unmentioned. In Outliers, Malcolm Gladwell focuses on the number of hours exceptional performers practice and says nothing about the fact that those students also slept an hour more, on average, than their less-accomplished peers, or that they took naps and long breaks.
This is not to say that Gladwell misread Ericsson’s study; he just glossed over that part. And he has lots of company. Everybody speed-reads through the discussion of sleep and leisure and argues about the 10,000 hours.
This illustrates a blind spot that scientists, scholars, and almost all of us share: a tendency to focus on focused work, to assume that the road to greater creativity is paved by life hacks, propped up by eccentric habits, or smoothed by Adderall or LSD. Those who research world-class performance focus only on what students do in the gym or track or practice room. Everybody focuses on the most obvious, measurable forms of work and tries to make those more effective and more productive. They don’t ask whether there are other ways to improve performance, and improve your life.
This is how we’ve come to believe that world-class performance comes after 10,000 hours of practice. But that’s wrong. It comes after 10,000 hours of deliberate practice, 12,500 hours of deliberate rest, and 30,000 hours of sleep.