Anecdote: I self-experimented with binaural beats some years ago. I did not notice anything regarding concentration, but I did find that tones starting in the n

Anecdote: I self-experimented with binaural beats some years ago. I did not notice anything regarding concentration, but I did find that tones starting in the normal awake/aware range and sliding linearly down to the slower, deep sleep range over 15-20 minutes would reliably cause me to fall asleep. I ultimately layered that audio behind a guided meditation relaxation track I found online and used the combination as a sleep aid for a few years.