Here's why it's easier to fall asleep on rainy days!

We don't usually pay much attention to our heart rate or breathing timing.

However, if you occasionally place your fingers on your wrist or place your hand on your chest and listen to your heartbeat, you will hear a seemingly regular rhythm.

But this rhythm is not entirely regular.

Yes, it's the same sound as rain.

Our bodies already incorporate this rhythm of "1/f fluctuation" in many places.

In other words, humans are just one of the creatures living in nature.

If we think of ourselves as part of nature, then it is only natural that we resonate with the sounds of nature, which have the same rhythm of 1/f fluctuation as our own.

Soothing natural sounds other than the sound of rain

There are many other sounds besides the sound of rain that have the rhythm of "1/f fluctuation," which is familiar to us humans and soothes our souls.

Among the sounds we hear often in our daily lives are the murmuring of a stream, the chirping of birds, the rustling of the wind, and the sound of a train passing by.

The reason why you might find yourself dozing off while being rocked on a train can be thought of as the effect of the rhythm of "1/f fluctuation."

In addition to sounds that can actually be heard, there are also "1/f fluctuation" rhythms that can be seen and felt with the naked eye, such as the flickering of a flame, moonlight, and sunlight filtering through the trees.

When waves crash on the beach, you can sense the "1/f fluctuation" both visually and audibly, and the same is true of the rain we are discussing today.

On rainy days, in addition to listening to the sound, you may be able to experience an even deeper healing effect if you also take the time to watch the raindrops falling to the ground.

[Relaxing Video] Natural Scenery / Aomori Juniko Lakes

Being in tune with the sound of rain can be soothing

As we have introduced, the sound of rain and our bodies share a common rhythm of "1/f fluctuation," and the reason we feel the healing effect of the sound of rain is because we are in tune with this fluctuation.

It is often said that when you are feeling sad, rather than forcing yourself to listen to cheerful music, listening to a similarly mellow, sad song will have a greater soothing effect, and this is also the effect of entrainment.

Humans tend to feel a sense of familiarity and comfort when it comes to things that share the same emotions and rhythms as themselves.

When you have sleepless nights or feel stressed, try listening to the sounds of nature, such as rain, as background music and spend some time soothing your mind.