Deja vu - what does it signify?

You know those times when you feel you've been there before or someone has said that before? When you know for a fact that it hasn't happened before? Those weird feelings of reliving a life that already existed. For Viv DuLac in my new historical (early medieval) time-slip romance, A Shape on the Air (Endeavour Press), maybe she has been there before ... ? Go to http://www.juliaibbotsonauthor.com