One of Leonardo da Vinci’s secrets was hidden in special sleep scheme: he slept 15 minutes every four hours; this way he cut his daily sleep time from 8 to 1.5 hours. Due to this scheme he saved 75 percent of his sleep and, hence, extended his life time from 70 years all the way up to 100. Nicola Tesla slept for 2 hours a day, starting from age 19, and had enough time to do a lot during his life. By far not everyone can handle such schedule for long. Full story