deja vue hits me all the time, and i never have a deja vue experience without having what i call 'double deja vue' (having dejavue about having dejavue), like what sunflower was talking about, sometimes this effect even triples. logically, i think that it is caused by an interruption in transmission of received information throught the braincells (that is, that moment is repeated in your mind because your brain thinks it didnt transmit it right the first time or something), but then i have had experiences where the deja vue triggers a memory of having a dream with that exact moment in it, and having knowledge of that dream moment during my waking life for a period of time after the dream. if anyone has any theory for this, or at least for the 'double deja vue' effect, i would love to learn more...