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I was just reading some older threads on the forum through a few searches, and I came across this thread:
And I ended up watching Ajahn Brahm's talk about "What happens to you when you die?" and it was actually really good. I very much enjoyed his talk around near death experiences, but what I found especially interesting was the section on the similarities between meditative visions and what happens after death, around 55 mins in. If you can see and perceive after death, a lot of the Buddhist teachings on the nature of perceptions and what arises should still hold. That blew my mind... A whole lot of the mechanism would still have to exist.
A lot of the discussion around consciousness and sleep I found interesting as well. I've experimented a bit with yoga nidra and some other techniques and it triggered a few things. Mostly I still find sleep impenetrable, and the most restful states I have encountered have still just been actual, proper deep sleep after heavy exercise.