The only time I have problems is when I sleep.

I've realized that most of my best ideas have followed a good night's sleep.

Six hours sleep for a man, seven for a woman and eight for a fool.

My mind is a chest of drawers. When I wish to deal with a subject, I shut all the drawers but the one in which the subject is to be found. When I am wearied, I shut all the drawers and go to sleep.

I prioritize sleep unless I'm traveling in different time zones. Sometimes getting eight hours is impossible, but I am very focused on it, and I need eight hours. I think better. I have more energy. My mood is better.

You must sleep sometime between lunch and dinner, and no halfway measures. Take off your clothes and get into bed. That's what I always do.