Some sounds can even pull a person out of deep sleep. How does he not wake a person, but, on the contrary, helps to sleep more soundly?

Why does a person wake up from sharp sounds?

First you need to understand why, in principle, people can get out of sleep due to sharp sounds. Scientists conducted a whole study, during which they established that such a feature appeared in the process of evolution.

In ancient times, when primitive people did not yet speak, they communicated using signals. And when danger arose, representatives of the tribe issued sharp loud cries that could not be heard. Gradually, the brain learned to respond to them even during sleep. This helped people who heard warning signals wake up, recover and start saving their own lives.

This feature has been preserved in modern man. If while he is sleeping, there will be a scream or other sharp sound nearby, the brain will immediately wake up.

Why does the sound of water sleep so well?

As mentioned above, the human brain reacts to sharp loud sounds during sleep and wakes up. However, the noise of water rises gradually, as the waves approach. Because of this, it is not perceived by the body as an alarm. Moreover, a smooth increase in volume and its gradual decrease has a calming effect.

And since the noise of water can reach a high volume, it is able to drown out other sounds that can be regarded as a danger.

Interesting fact: Many babies fall asleep well under the tap water, as it is perceived by them as a soothing sound.

Now scientists are engaged in the search for other noises that can be regarded by the human brain as “soothing”. Also, modern smartphones periodically receive applications containing similar sounds that allow you to quickly fall asleep.

Under the sound of water, he sleeps well, because the brain perceives it as a calming signal. Sounds of waves are not sharp, but gradually roll and subside. Because of this, the body does not see a danger signal in them and continues to be in a state of sleep.