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Comment by lsaferite | Hacker News Reader

A friend of mine bought a device that does this a while back and swears by it's effects. He lent it to another mutual friend who also had similar opinions. I have no personal knowledge of the efficacy, but if anyone is interested, this is the device he purchased: https://www.gammalightandsound.com/

I have no affiliation with that site, just sharing knowledge.

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There was an article (I think I found it in hackernews) a while back about a study that showed 40hz having these restorative abilities.

I installed a frequency generator app on my phone after reading it. I also made a binaural tone generator tool:

https://numtel.github.io/binaural-playground/

From what I read, low frequency waves can influence awareness at different level:

    1-4 Hz: Delta (Deep sleep)
    4-8 Hz: Theta (Meditation/REM)
    8-14 Hz: Alpha (Relaxation)
    14-30 Hz: Beta (Focus/Energy)
    30-100 Hz: Gamma (Maximum Awareness)

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