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Drowsy often associated with the sound of rain, and not in vain. The rhythmic tapping of drops on a roof, ground, or umbrella is sometimes referred to as pink noise: it is believed that light with similar frequency characteristics would turn out to be exactly that color. This is a kind of background sound, which, like “white noise”, covers almost the entire range audible to humans – from 20 to 20,000 Hz.
At the same time, “pink noise” sounds quieter at high frequencies, which, according to studies, can reduce brain activity and improve sleep quality: three-quarters of the participants in the experiment on the effect of “pink noise” on the body slept more peacefully under the rustle of rain. Why an umbrella turns inside out in strong winds: Bernoulli's law.