Maybe you have had a relaxing experience where you can relax your shoulders by listening to the sound of the river (river murmur).

The sound of flowing water contains a waveform called "1/f fluctuation" which has a calming effect on the human mind, and is said to be effective in relieving fatigue and relieving stress.

Additionally, water is said to have a visually healing effect, and the pure image of flowing water and sparkling light soothes and soothes the viewer's mind.
reading, sleeping and meditating.
Rain Sound Natural
rain for sleep, sounds of rain and thunder for sleep, noise of rain, sound of rain, sounds of rain, rain with a thunderstorm for sleep, sound of rain rain outside the window, noise of rain and thunder, noise of rain for sleep, noise rain outside the window, sounds for sleep, for sleep, thunderstorm for sleep, rain thunderstorm for sleep, noise of rain with thunder, sound of rain for sleep, sound of rain and thunder , rain, rain sounds, rain sounds for sleeping!