It was a fact widely known that Margaret Thatcher could get by on only four hours’ sleep a night.

And just like the former British prime minister, some high-profile business leaders also claim to do their best work on only the briefest of shut-eye. Jack Dorsey, who is CEO of both Twitter and the payments company Square, said recently: “I don’t sleep much, but it’s enough.”

So why is it that some people can be productive and energetic despite getting less sleep than everyone else?
https://www.weforum.org/agenda/2017/04/not-sleeping-gene-mutation-california-research/