[craigdfrench]

I have been using Muse (no affiliation) which has a headband that measures brain signals, for me, it seems like it is able to tell when my mind has wandered off thinking about life's minutia, when I am supposed to be concentrating on breathing. It gives the feedback by stirring up the sound of waves and wind and really tries to get you back on track. This is my prompt to let go and recommit to focusing on my breathing and then the waves and winds will calm down again.

[inafewwords]

Not sure if this works, but I was using those sound entrainment binaural beats for theta deep sleep waves, or set to meditation. There's some free frequency generators online or app store. You should try it with your headband to see if there are increases in frequency of the binaural beat frequency you've chosen in app

[craigdfrench]

That sounds really neat. I will give it a try.