Over the years I have spent some time analyzing my own deja-vu experiences. In my experience deja-vu has been an error in memory re-collation. What happens is a certain set of circumstances causes a partial memory re-collation or emotional response but doesn't recall the whole memory. Therefore it seems like you have done this before because you don't fully make the connection between the current circumstances (the trigger) and when you last experienced them (the memory). I have had this error happen when it links back to dreams as well. I believe this is more emotionally based than pure memory but I don't fully understand it.
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What interests me more though than deja vu are those occasional flashes of a place something like heaven, deeper than deep emotions, feeling of being connected with some element of something that's older than time itself and has more epic significance than anything of this world could possibly have. This feeling I think has another name, which I've forgotten, but it's a lot more powerful, a lot more mysterious, and it's something I've wanted to know more about for a while as to whether or not it has a biochemical base to it.
I have experienced this a lot more (and more intensly) since I started having more serious anxiety problems. At least with me I believe this is what they call a manic episode (bipolar type stuff). I will feel really good, like I have a purpose in life, I understand everything, and that I am connected to something greater. I imagine everyone has these at some point but maybe not to the degree of people with other issues like autism or bipolar disorder. My guess is that this is what cocaine must feel like. Some sort of dopamine/endomorphine thing?