3 Hz Binaural Beat for 12 Hours Deep Sleep Delta Wave

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The brain produces a phenomenon resulting in low-frequency pulsations in the amplitude and sound localization of a perceived sound when two tones at slightly different frequencies are presented separately, one to each of a subject's ears, using stereo headphones. A beating tone will be perceived, as if the two tones mixed naturally, out of the brain.

https://en.wikipedia.org/wiki/Binaural_beats