The first time I heard brown noise, I was instantly lulled into a state of deep relaxation. The tones were much more velvety and lower-pitched than the better-known sound of white noise, which, to me, has always sounded staticky and impossible to sleep to, despite what many people say about its somnolent properties.

Aside from sound clips on TikTok and anecdotal claims in support of its soothing ability, it was difficult to find a lot of........

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