I recently purchased a neurotrek device that uses direct electrical stimulation to put you in a particular pattern. Its QUITE powerful, and practically puts binaural beats to shame.

It's supposed to be good for the brain because it uses microcurrent that mirrors the brains own waves.

If anyone can find evidence to the contrary I'd be very interested.. but right now I'm looking forward to having someone increase the frequency on the device while I'm already sleeping(lucid dreaming!).. alas it does only have manual control.

On that note.. does anyone know of any binaural programs where the frequency moves from say delta to alpha over the course of a few hours? Sbaagen does not seem to have that.