There is so much information out there about people who wake up early - for example, Apple's CEO, Tim Cook, wakes up at 4:30, as does General Motors' CEO and Disney's CEO.
What I never hear about is what time these people are going to bed. I have a hard time believing they're going to bed at 8:30 so they can get their full 8 hours of sleep.
So, my question: When do "Early Risers" go to sleep?