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The worst manifestations of exhaustion were successfully cured by a long period of rest but it was immediately apparent to me that I had lost once and for all my former capacity for carrying out experimental work until physically tired.

I know that I've overfed myself trying to prop myself up because I'm exhausted.

I'm exhausted almost all the time.

I've been working pretty much 12-16 hours a day, six or seven days a week since May of 2003, and every time I see a photo of myself, I realize that there is never a time when I don't look exhausted.

I've got so many ideas, and sometimes the more exhausted my body gets, the more active my mind gets.

I prefer physical exhaustion over mental fatigue any day.

I'm a workaholic. Before long I'm traveling on my nervous energy alone. This is incredibly exhausting.

I think I'm chronically exhausted.

Everyone is always telling me that I must be exhausted, but I've learned how to use my time well, and that includes holidays to recharge. I always try to give myself big chunks of time to think about what the next project is going to be.

When you're at your absolute, most exhausted... That's when you have to be at the top of your game.