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The term déjà vu is French and means, literally, "already seen." Those who have experienced the feeling describe it as an overwhelming sense of familiarity with something that shouldn't be familiar at all. Say, for example, you are traveling to England for the first time. You are touring a cathedral, and suddenly it seems as if you have been in that very spot before. Or maybe you are having dinner with a group of friends, discussing some current political topic, and you have the feeling that you've already experienced this very thing -- same friends, same dinner, same topic.
Originally posted by TomorrowNeverCame
What if deja vu has to do with another reality... Like for instance, in another dimension of time that is oh say a few seconds behind our own something happens. Then as the dimension merges with ours the same evernt happens and our mind thinks it has already happened because of the merger with our other self (or whatever you would like to call it). I also agree with racos reply about our brain trying to wake itself up.