Thomas Edison: The famous inventor only required about three to four hours of shut eye each night, according to The New York Times. He regarded sleep as "a heritage from our cave days."
Benjamin Franklin: In his autobiography, Franklin published his typical daily schedule. He appears to have slept only five hours a night, from 11:00 p.m. to 4 a.m.
Nikola Tesla: An even more restless inventor than Franklin or Edison, a biography of Tesla by a personal friend claims that he would sleep as little as two hours a night.
Margaret Thatcher: Britain's longest serving Prime Minister was famous for getting by on just four hours of sleep each night while in office, according to the BBC.