This Must Be Heaven : Sam Harris responds to Eben Alexander’s near death experience.

I must admit that I was deeply moved the first time I heard Alexander recount his seizure and ensuing comma. His description of his NDE–a hyperreal encounter with numinous beings from another world lying in wait beneath the phenomenal space and time of our present earthly incarnation–was not all that unfamiliar to me as an alchemical practitioner and scholar of esoteric religions.

I think Harris is looking in precisely the right place in order to further the inquiry into the nature of consciousness; namely, the various means we have of altering it, including diet, dance, meditation, and especially psychedelic chemistry.