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Comment by jimmaswell | Hacker News Reader

could you find the exact one?

The beat frequency? Not really; I used an app called Gnaural (on Android, hasn't been updated in years), and just selected the "Power nap" profile. It'll be theta or delta though, maybe a combination.

Looking at the beatfreq values in the XML source of the preset [1], it's indeed combination of 4 to 11 Hz beats (mostly theta) and 2 Hz (delta).

[1] https://sourceforge.net/projects/gnaural/files/Presets/Minds...

Oh nice, thanks. I didn't think to check the source. Been thinking to update the app myself though as it's not installing on my current device, and I'd like to explore BBs more. I've also found "Energize", "Problem resolver", "Wakeup", "Rain shower" and "Babbling brook" to be useful. The rest by comparison are pretty meh, or maybe I just didn't find a task match.

There are lots of them on YouTube now. I listen to one most nights. Just search for “sleep” and “binaural beats.

I'm sure there are differences in their effectiveness.

Based on my limited knowledge the sound frequencies attempt to put the brain into theta or delta frequencies and does this by creating a ghost signal (left ear 100hz - right 106hz gives a 6hz theta wave).

Dreamachines work similarly (but mono) by creating a flickering light at set frequencies.

I'm sure tactile vibrations or pulses could have some effect also.

I made this a few years ago after getting into Hemi Sync tapes to test out what different tones feel like.

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

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