I've always been fascinated with the sensation of déjà vu and feel as if I regularly experience it. The thing is, I've never thought to research it until now. According to a few articles i found, including the one above ( from psychologytoday.com), déjà vu is one of the many subjects in psychology that few care to take interest in because of how difficult it is to explain. There has been little research about the topic, but only because it has been impossible thus far to recreate it on demand. Apparently there are several theories out there trying to clarify the mysterious but recognizable feeling that comes with déjà vu. Not one seems more right than any other so to say. It's all still up for judgment. Take a look at the article and see which theory you think best fits and remind yourself of it whenever you feel déjà vu hitting you. It's quite interesting (especially the little bullet points at the end of the article. I never would have guessed).