How many hours of sleep are necessary for man?

Considering all our psychological functions, it is not surprising that a third man spends life sleeping. Scientists have been able to discover, that the brain accumulates Show all details of the day, while we are in bed.
Insomnia is not a disease but a symptom that can last for a short time or be in effect for a long time. 10-26% of people suffer from transient insomnia, 7-20% of people suffer from chronic insomnia. Some of the greatest leaders of the world, from Napoleon Bonaparte, Churchill, Clinton or Teçeri, said that sleep a maximum of 6 hours to 24.
Hours of sleep needed depends on the age
16 hours for newborns
10 hours for 3-18 year olds
8 hours for 19-55 year olds
6 hours for the 56-year-old