Tony Schwartz, Harvard Business Review; Sleep is More Important than Food:
"In Anders Ericcson's famous study of violinists, the top performers slept an average of 8 ½ hours out of every 24, including a 20 to 30 minute midafternoon nap some 2 hours a day more than the average American.
The top violinists also reported that except for practice itself, sleep was second most important factor in improving as violinists."
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