Tony Schwartz:

… why is sleep one of the first things we’re willing to sacrifice as the demands in our lives keep rising? We continue to live by a remarkably durable myth: sleeping one hour less will give us one more hour of productivity.</p>

[…]

Great performers are an exception. Typically, they sleep significantly more than the rest of us. 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.

Get some sleep. Profit.