Are NDEs caused by carbon dioxide overload? And what about psychedelics?

    Notes from Pim van Lommel, Consciousness Beyond Life: The Science of the Near-Death Experience (New York: HarperCollins, 2010), 119-121:   Oxygen deficiency is accompanied by an increase of carbon dioxide, and this increase has been suggested as a possible cause for near-death experiences.  Patients breathing in unusual quantities of carbon dioxide have been known to […]