NDE's: possibly caused by high CO2 blood levels

http://news.nationalgeographic.com/news/2010/04/100408-near-death-experiences-blood-carbon-dioxide/
This is a really interesting article. What's your take on it?
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Welcome to 15 years ago?
Twilight blue-light-at-the-end-of-a-tunnel experiences while being incapacitated and barely conscious have been associated with encephalized CO2 levels since at least the mid-90s. (That's when I remember seeing/hearing about it on TV, as a young'n)
blablablah
I am surprised the article didn't mention the fact that increasing CO2 causes cerebral blood flow to rise. Which is a well recognised phenomenon in medicine.
Signature ? How ?