There's a specific frequency of brain waves which are always correlated with wakeful consciousness. I never looked up whether 'binaural' stuff is normal in that

There's a specific frequency of brain waves which are always correlated with wakeful consciousness. I never looked up whether 'binaural' stuff is normal in that same freq range or the lower ranges. The lower freq ranges are still present even during unconsciousness (or anesthesia), and so focusing the brain on those frequencies would either 1) help concentration or 2) help sleep? I'm not sure which.