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

French scientists have conducted an international study in seven countries and found, that lack of sleep undoubtedly leads to excess weight. This is explained by the activity of two hormones: Ghrelin responsible for hunger and Leptin reducing appetite. If one sleeps only 4 hours a day during two days running, the secretion of Ghrelin increases y 28%, while Leptin levels reduce by 18%. Full story