...On Deja Vu

Ok so I've asked this one before I think to my friends. Deja vu, how many times a year would you say you get it? I mean I don't want to make it like I have some sort of supernatural ability, but It's weird I get deja vu pretty often. I get deja vu pretty often. I don't know if it's because there are certain activites that are so repetitive in my life that it's only a matter of time before I start the cycle all over again and repeat an activity. Repeat an activity. Ok so I'll be on the train and I'll be listening to an album, and say to myself "wow I saw myself in my minds eye listening to this song while going over the manhattan bridge." Pretty normal stuff right, because lets face it songs are bound to repeat on my walkman and I do go over the bridge everyday twice a day. But what's strange is sometimes I'll be thinking about something, sometimes things so weird that I've definately never thought before while listening to that song while going over the manhattan bridge that's it's eerie, because this is the first time it's happening yet I knew it's so familiar like it's happened before. So I get deja vu so often that I'm thinking maybe there's something to it. Is there a way to test this? Someone come up with a way and let me know.