Drop of water
Why the sound of water helps you sleep: Study reveals how non-threatening noises are blocked out by the brain
In part, it is because the brain interprets these sounds as 'non-threats,' according to an associate professor from Pennsylvania State University, and it can use them to block out other, more alarming noises.
While a shrill sound can jolt you out of a deep sleep, the pattering of raindrops in a quiet forest will exist peacefully in the background.
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