Learning and memory happen when you are asleep, he said. A laboratory mouse rehearses a path through a maze to get to a piece of cheese while asleep.
The area of a basketball player's brain that is used to shoot a ball will have much greater slow-eyed sleep period since there is more for it to store, he said. Players shoot better after sleep.
The Portland Trailblazers consulted with him after they lost a series of East Coast basketball games, he said. He was able to give their players strategies for being sharper when traveling across time zones.
He's worked with the Rolling Stones on their sleep problems, he said. Musicians are vulnerable since they are often traveling across time zones and usually "all keyed up" to perform at night, he said.
Czeisler developed a program for NASA to help astronauts deal with sleep issues in orbit, where they have a sunrise and sunset every 90 minutes.
Other clients include major industries that are concerned about night shift workers falling asleep on the job, the CIA, the Secret Service and the U.S. Air Force, he said.
Jackson lawyers argue that AEG Live should have consulted a sleep expert like Czeisler for Jackson instead of hiring Murray -- a cardiologist -- for $150,000 to treat the artist.
The trial ends its eighth week in a Los Angeles courtroom Friday. Lawyers estimate that the case will conclude in early August.