Why do you sleep so well on rainy days?

Why do you sleep so well on rainy days?

Why is it so easy to fall asleep on rainy days? Some people say that rainy days are a holiday given by God, which is absolutely true. Rainy days can always make people sleep at home, and the quality of sleep is particularly good! Do you know why it is so easy to fall asleep on rainy days? Let's get to know each other.

Why do you sleep so well on rainy days? 1 The shielding effect of rain sound.

Although the ears can hear all kinds of sounds, at some point, the brain only receives the most important sounds. For example, in a meeting, although there may be ringtones, computers running and cold air around us, we will only pay attention to everyone's speech. This is called "masking effect".

Shielding can be used in many places, such as using the ticking of tap water to make sound insulation, so that only a few people can hear the conversation in the office, and the music in the coffee shop also has a good shielding effect, so that people will not be disturbed by the next table. If the blocked sound suddenly disappears, just like music stops, you may find yourself in a very noisy environment.

So is the sound of rain when sleeping. Whether it's light rain or heavy rain, as long as the frequency is relatively fixed, it can help isolate the ever-changing sounds, such as the sound of cars and speeches, which will make people's brains enter a "blocked" state and send out information that is safe now, so they will sleep better.

The changing sound will become an alarm system.

Then why does the brain feel safe when it is blocked? In the physiological mechanism of the human body, hearing is a 24-hour alarm system to help people face sudden changes and crises, but the human body still needs to rest, so as long as the brain is used to a sound, it will be judged as "harmless" and then enter a more relaxed state.

Of course, if the sound exceeds a certain level, there is still the possibility of "being too noisy to sleep" because of too much auditory stimulation, which is partly related to the "sleep spindle wave" released by the thalamus; Spindle wave is a noise isolation mechanism to prevent the brain from interfering with sleep because of too subtle and harmless sounds. The more people release spindle waves, the higher the decibel that needs to be disturbed.

However, the sound of rain does not represent danger in people's memory. Unless the brain is connected with "naked" and other related factors, even if it exceeds a certain decibel number, the brain will only be awake for a short time, judging that it is harmless and continuing to sleep; On the contrary, it is a mosquito sound with a small decibel number, because the frequency changes more and it interferes with people more.

Therefore, for the brain, rainy days not only have the function of shielding other sounds, but also represent that external' harm' is not easy to appear, so it will naturally' sleep well'. If you feel sleepy next time, you can try to play some music with the sound of rain, which may help your brain relax and fall asleep!

One of the two reasons why it is particularly easy to fall asleep in rainy days: the sleeping aid effect of pink noise.

Newton said: white light, there are various colors of light.

In fact, the sound is colored, and the rain belongs to "pink noise", which is between white noise and brown noise. This kind of noise has been proved to be helpful to sleep, because it has the function of shielding external noise and reducing brain activity.

When we sleep, the auditory system is still working, and those sudden sounds often affect our sleep quality.

Pink noise is evenly distributed in the power spectrum, which can cover up those sudden changes and shield many small sound changes that you don't realize but actually affect your sleep, creating a gentle sound environment.

Some studies have found that when rain enters the brain, the brain will unconsciously relax and produce alpha waves, which is very close to the state of the brain when the human body sleeps.

In fact, not only the sound of rain, but also the sound of water, wind, trees, cicadas, frogs, birds and watching beautiful nature have similar effects.

Because the experience of natural environment can make people feel caring, happy, friendly and released, and can relieve tension and pressure, this phenomenon is called "the recovery of natural environment experience".

The second reason: the content of negative ions has increased.

In rainy days, due to the potential energy and kinetic energy formed by air pressure or water pressure, water molecules in the air or water will crack, resulting in a large number of negative ions.

If the atmosphere is ionized by lightning, it will produce more negative ions.

The increase of negative ions will make the air fresh and obviously improve the functions of nervous system, cardiovascular system, blood system and respiratory system, making people feel very comfortable.

In addition, negative ion is a natural sleep aid factor, which has sedative and hypnotic effects and makes people fall asleep more easily.

It is recorded in The Application of Air Negative Ions in Medical Care and Environmental Protection: Clinical experiments show that negative ions can promote the oxidative deamination of monoamine oxidase, reduce the level of 5- hydroxytryptamine in brain and tissue, and then cause a series of obvious physiological changes such as endocrine and nervous system, which has a good regulatory effect on higher central nervous system and autonomic nervous system, effectively improving the function of cerebral cortex and effectively improving the adverse symptoms such as insomnia and neurasthenia.

The third reason: special weather activities are limited.

From the perspective of human evolution, from ancient times to farming times, even today, rainy days mean holidays.

Many things are restricted because of the weather. I can't work in the fields, because I can't go to school in heavy rain, and I can't go anywhere in rainy days ... I can only sleep at home, feeling that everyone is stopping, just in time to be lazy.

Although we haven't changed anything because of rainy days, the time for human beings to enter modernization is not enough to change the genetic habits formed by the interaction between man and nature for hundreds of thousands of years.

Some people say that there are people running around in the rain outside because of such heavy rain, but I am so happy that I can sleep comfortably at home. Do you think it makes sense?