Something that has always come into many peoples lives, at some point or another.
What causes it to occur, & how come nothing happens for days/ weeks on end, then out the blue fragments keep appearing....
What is the real meaning behind it, are we over thinking or such ?
Some have numerous reasons behind it, from it being neurological to dreaming events before it happens, whether its recent or several week/days later.
The best version I've heard was it means you're going on the right path, which questions another thing, have we reincarnated before, but don't remember, because the slate was wiped clean before it started from day one.
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From @drvimto