What lifestyle secret do Leno and Karno share?

What an earth could Jay Leno and Dean Karnazes possibly have in common? Well obviously they both are pretty famous, popular and succesful, so they are on TV and other media a lot, but that's not the answer we are looking for here.  

The correct answer is: both are allegedly 4-hour sleepers. 

In this Runner's World video Karno's dad chats about his son's daily schedule.   

I agree with what he mentions at the end, most of us ordinary sleepers are lucky to get by with 8-12 hours a day. And if I worked as hard as Dean, I'd probably find it challenging to stay awake for four hours a day!