How many hours do you need to sleep?
Anxious to hear the news that the world was struck by an epidemic of sleep deprivation - supposedly modern man sleeping less and less.
Dream is certain, the longest occupation in our lives.
Some people do not need a spine, the other - the eyes, some even costing clot nerves instead of a full brain, and dream apparently is needed by all. That's just the scientists can not sort out what is its primary purpose.
There are several hypotheses. In the dream, and the people and animals do not move, so spend less energy - the benefits are obvious. Immune processes in sleep the body does not take place as during wakefulness.
Another probable that in a dream the brain and the rest of the nervous system are cleared of toxic substances that have accumulated during the day, and the DNA is recovered after breakdowns.
Lack of sleep definitely dulls the mind and reaction time. Finally, sleep is necessary for processing information and "soldering" brain - sleep makes us who we are. In any case, without it we do not own.
What would neither was the main feature (and no matter how others live animals), human sleep is necessary. U.S. each third adult sleeps less recommended seven hours per day, but more than half a century expectancy sleep is almost unchanged. And in the 18 countries belonging to the OECD, in 2009, people slept an average of for more than eight hours, which is closer to the upper limit of normal - nine hours per day.
However, the quality is important not less than the amount. It is influenced by a variety of things: the noise, the room temperature, the level of carbon dioxide in the air.
Our site offers to determine enemies and friends good night's sleep: