Before I bother to comb through the 3.2 k comments, perhaps someone can tell me ;
Who on Earth can sleep wearing headphones?...
To me, that disqualifies Binaural beats...
I have been told that 
Isochronic (?) beats do not require headphones ...?
It's physically impossible to hear a "binaural" beat without headphones.
When you listen with speakers instead of headphones, you hear an acoustic (or monaural) beat, not a binaural beat.
This video explains more: http://bit.ly/bineye1what
L Paine