At the risk of sounding surly, this all sounds very 'stoner-y' if you know what I mean. 
Sure, I've meditated before, prayed before, you know, sat on the edge of a lake and thought very deeply and calmly before, but does that constitute a change in brain state via the mechanism of 'brainwaves'? 
Does it always have to be a profound esoteric ritual that enables these sorts of change in brain state, or could it happen simply when I am taking a shit or something?