Not sleeping? You might be part of a genetic elite

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?

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