In response to the above:

I know *exactly* what you mean. I often have a sharp moment of feeling like I’m in another life, another whole existence and I know that person’s history, setting, everything. I used to call it jamais vu as a play on deja vu until I found out that was already in use: https://en.wikipedia.org/wiki/Jamais_vu

It’s most often triggered by music but I can’t make it happen on purpose, it’s entirely random! It’s not favourite bands or songs or always unknown, there’s no pattern I’ve been able to divine. Some music will start and, suddenly, I’ll be on top of a mountain I’ve never been on or in New York in 1934 as a kid.

I like to think of it as quantum bleedthrough enabled by the brain structures that Roger Penrose posited.