Eli5: Chemically, what happens inside the brain as we begin to die?

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I’m taking like, the last few moment’s. Is there a massive release of chemicals? If so, what are they and what do they do? If not, what do we know about what happens in the last few moments?

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It has been said that the brain releases DMT when it’s dying which accounts for many of the hallucinations and past-life and religious experiences people report.

This is rumoured to be a sort of defence mechanism so that the mind could possible flash up a way to save yourself from death as a last resort.