Why do forest sounds assist you fall asleep

https://rainsoundsspot2.skyrock.com/3330860006-Why-do-nature-noise-enable-you-to-snooze.html

The crash of ocean waves, the babbling of brooks, the pitter-patter of rain on shingles — A lot of people swear by these watery sounds to assist them fall asleep and stay in la-la land. Why does flowing "agua"