Oh God, the Chicken! » Polyphasic Sleep Experiment
Polyphasic sleep is the practice of sleeping multiple times per 24 hr day rather than a single nights’ sleep, usually resulting in significantly less overall daily sleep. A simple version could invovle a core nap of 4.5 hours with two 20 minute naps during the day, where the ultimate version requires six 20 minute naps spaced out evenly in a 24 hr period (for a total of 2 hrs a day!)






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http://ajp.psychiatryonline.org/cgi/content/full/159/4/519
Da Vinci, on the other hand, lived to the ripe old age of 71. The last 3 years of his life he spent as a guest of the King Francis I of France.