On the topic of brain waves...

Here is a video of Ken Wilber, hooked up to an EEG machine, and turning off his brainwaves through meditation (he pauses the video, so it's not as impresive as it looks, but still, to see all brain waves go down to zero on command is still pretty compelling

the other thing to notice, that he points out in the video, is that his delta waves are constantly up. (these waves shouldn't even be active in wakened state, they're only really active during the deepest parts of your sleep cycle)