The moment I knew I needed more sleep was four years ago, when I learned the value of sleep -- the hard way. I'd just returned home after a week of taking my daughter on a tour of colleges, and the ground rule was no BlackBerry during the day, so I stayed up very late to catch up on work. Next thing I knew, I was lying on the floor, bloodied. I had passed out from exhaustion and banged my head on the way down. The result was a broken cheekbone and five stitches under my eyebrow. And it was also a wake-up call, leading me to renew my estranged relationship with sleep.
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