Tony Schwartz in The New York Times: Sleep as a Competitive Advantage

"More than ever, I’m convinced that sufficient sleep is a uniquely powerful fuel for sustainable performance. Among all the behavioral changes we help our clients make in their lives, none have a greater impact on how they feel and perform than getting more sleep. It’s also true that the greater the performance demand, the greater the need for rest and renewal. Instead, most of us do just the opposite: as demand increases, we simply hunker down, push harder, for longer."

I have handful of "Incredibly Obvious Software Development Secrets" (hat tip to Steve Kalkwarf), and getting enough quality sleep is right there at the top of the list. I've also found that the quality of the mattress you sleep on makes a huge difference, so be sure to get the best mattress you can afford.