of Deja-vu experiences for me, but spaced out ( I mean, in time, not me) and really strong, lasting for a couple minutes to a half hour, usually. Usually dreams, sometimes years before it happens, are the source of the deja-vu and I remember them when it happens. Usually the dreams are a few months to weeks before the moment in time. I never get anything particularly useful, though. That would be good. I get the feeling maybe three times in a year.
I also felt like that in the Orkney Islands most of the time I was there. It definitely tempts me to consider the validity of past lives. Or maybe cellular memory? The same blood runs in my veins as theirs, if somewhat watered.