Q :A member of your family said that one of your ways of staying fresh
and alert is by taking catnaps?
A : Yes, that is one of the things. I can sleep anywhere, anytime.
For example, people wonder why I can start work upon reaching home
after a journey from London to Kuala Lumpur. But I do sleep.
I sleep more on the plane than on the ground. I can sleep more than
10 hours on the plane, on the ground normally I sleep six hours.
And that is sufficient rest for some adjustment to the time and to
the jet lag.
source : The star