It's not that we simply get old, and memory starts to go, and sleep starts to deteriorate. But those two things actually are significantly interrelated.

If you were not to set an alarm clock, would you sleep past it? If the answer is yes, then there is clearly more sleep that is needed.

I think sleep is probably the neglected stepsister in the health conversation today. I think we've done a good job regarding physical activity and diet, but sleep has remained out there in the cold, and that's surprising to me.

Below seven hours of sleep, there are objective impairments in the body. Eight hours are recommended.

I think for more than half of my career, I have refrained from talking to the media.

A tremendous number of people in America work very hard at something that bores them. Even a rich man thinks he has to go down to the office everyday. Not because he likes it but because he can't think of anything else to do.

One element of Madonna's career that really takes center stage is how many times she's reinvented herself. It's easier to stay in one look, one comfort zone, one musical style. It's inspiring to see someone whose only predictable quality is being unpredictable.

I'm very aware that to reach the same level and have the same amount of success will be extremely difficult.