Humans need sleep because it is necessary to maintain a normal level of cognitive functions such as speech, memory, creative thinking and flexibility.
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“Why do we sleep” is a question that has puzzled scientists for centuries, and the answer is “no one really knows for sure”. Some scientists believe that sleep helps the human body recover after a day of activity, but in reality the amount of energy saved after eight hours of daily sleep is very small – about 50 kcal, equivalent to an amount of energy. energy in a piece of toast. The best way to understand the role of sleep is to look at what happens if we don’t sleep. Lack of sleep has a serious effect on the brain’s ability to function. If you’ve been up at night for a long time, your personality will become grumpy, whining, irritable, and forgetful. After just one night without sleep, your concentration level will become more difficult, concentration time will also shorten significantly.

In real-life situations, the serious consequences of staff sleep deprivation are thought to have contributed to a number of international disasters such as Exxon Valdez, Chernobyl, Three Mile Island and Challenge, the space shuttle explosion.

Insomnia has an impact not only on cognitive function, but also on mental and physical health. It can cause disorders like shortness of breath, stress and high blood pressure, and sleep loss increases the risk of obesity because hormones and enzymes that control appetite and weight gain are produced during sleep. There is no set number of daily sleep times that apply to everyone. According to the results of sleep research records, people usually sleep between 5 and 11 hours a day and an average of 7.75 hours. “The amount of time a person needs to sleep is the time it takes for a person to stop feeling sleepy during the day at work,” says Jim Horne, from Loughborough University’s Center for Sleep Research.

Even animals need to be met with the average sleep time per day, the corresponding tiger species is 15.8 hours; cat species 12.1 hours; chimpanzee 9.7 hours; sheep 3.8 hours, African elephants 3.3 hours, deer 1.9 hours.

The current world record for 11 days without sleep is held by Randy Gardner in 1965. After the first 4 days he started hallucinating, followed by delusions that he thought he was a famous football player. . What is surprising is that Randy did quite well and functioned normally in the final days of the competition.