How much sleep do we need? Detailed answer

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How much sleep do we need? Detailed answer

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How much sleep do we need?

As we know, sleep is very important for us, because it helps to restore tired organs and tissues of our body. But how much sleep do we need? For most of us, eight hours of sleep is enough, but there are people who need much less, and some even more.

A lot depends on our lifestyle. But the most general rule, perhaps, is that we sleep only as much as is necessary for good health and full-fledged work while awake.

There are different levels of sleep: deep sleep and light sleep. In a state of light sleep, our body does not get the rest it does in deep sleep, so after eight hours of light sleep, we may still feel tired. Conversely, a short but deep sleep can give a very good rest. Alexander the Great was able to fall asleep deeply at any time.

One night before an important battle, he stayed awake longer than everyone else. Then he wrapped himself in a cloak and lay down on the ground. He slept so deeply that the commanders had to wake him up three times so that he gave the order to attack!

Usually, when we fall asleep, our sleep center blocks the nerves so that both the body and the brain can rest. This deprives us of the desire to do something and puts our limbs and internal organs to sleep. But sometimes only one thing falls asleep: either the brain or the body. A very tired soldier's brain can fall asleep while on the march while his body stays awake!

Author: Likum A.

Random interesting fact from the Great Encyclopedia:

How much fluid does a person need?

According to the most common view, a healthy, normal person weighing 70 kg needs 2-2,5 liters of fluid per day. About half of it comes from food, the other half from water and drinks.

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Random news from the Archive

Babies notice things that elude adults. 11.07.2023

We can usually recognize an object even if it flashes before us for a short time. However, if another object appears immediately after the first one, the perception of the first object suffers and we stop noticing its presence.

This phenomenon of visual perception is called "reverse masking". In science, it is used to study how the brain processes visual signals. Interestingly, this phenomenon occurs even in cases where the second object does not spatially overlap the first one, but is represented, for example, by a contour or by four points surrounding the object.

It is assumed that the occurrence of this phenomenon is associated with a violation of the "feedback mechanisms". The visual information we see is processed sequentially in the brain from lower to upper visual areas. However, feedback also plays an important role in visual perception, when visual signals are transmitted from the upper regions of the brain to the lower ones. It is believed that backmasking occurs due to disturbances in feedback processing.

The scientists applied the reverse masking technique to infants between the ages of 3 and 8 months to study the development of feedback mechanisms.

To test for backward masking in infants, the researchers showed them images of faces on a computer screen and measured the time the children paid attention to them. This step turned out to be fairly easy, as babies tend to look at faces longer.

The face images were presented in two ways: in one case, the mask image followed the face, and in the other case, nothing appeared after the face.

The researchers found that children aged 7-8 months could not distinguish between faces followed by a mask. This indicates that they, like adults, experience the reverse masking effect.

However, children aged 3-6 months were able to perceive faces even when they were followed by a mask. That is, reverse masking did not occur, and infants could see faces that are invisible to older children.

These results suggest that feedback mechanisms are immature in infants under 7 months of age. The study showed that the processes of visual perception change significantly in the second half of the first year of life.

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