The Sunday Telegraph (Sydney) - Body and Soul - - SLEEP SPECIAL -

The ul­ti­mate Re­nais­sance man had a re­mark­ably pro­duc­tive ca­reer, paint­ing and draw­ing the likes of the Mona Lisa as well as dream­ing up a he­li­copter pro­to­type. How did he fuel his fruit­ful life? The ‘Uber­man’ sleep cy­cle, of course. Rather than sleep for a clump of hours each night, Da Vinci is said to have taken a 20-minute nap ev­ery four hours in or­der to boost his pro­duc­tiv­ity through­out the day. This habit is also known as a polypha­sic sleep cy­cle.

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