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luna-tic - Any experience that is real, but defies a rational explanation. Yes, euphoria can in certain, unexplained circumstances fall into this category. People in the most demanding and dangerous of circumstances have reported feelings of a "peace" previously unknown, and unexplained, puting it down to the presence of a "loved one" (wrong) or the presence of God, or an angel.
There seem to be so many people that have such experiences, that, in my opinion, they cannot be simply written off as self delusion, even after some have been rationally explained.l