I don't know if I just have deja vu or if I really do dream things (small details, like a flash of a scene - similar to what Creative spoke of in her first post) before they happen but I sometimes find myself in situations where I just KNOW that I've dreamed something. Perhaps it's just deja vu, as I've never felt that before. I'm not sure
I have this happen to me a minimum of once a week . I find it really frustrating and wonder if I'm just loosing the plot .
However I have heard people refer to this in the sense that we live "paralell lives" and that where we get these feelings of having done something before.