Really interesting, I’ve never heard / heard of this sound before but it reminds me of a sound that I’ve always wanted to recreate. During an episode of sleep paralysis I’d often hear something that seems like a whooshing, droning or pulsating sound that would get more and more intense and enveloping. Since it usually occurs during the hypnogogic state it is hard to recall exactly what it sounded like or whether it could actually be described as a sound at all. Either way I will one day attempt to ‘capture’ it.

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