Wait, Didn't We Already Do This? Déja-vu

Haven't you ever had those moments, where you're like, Holy cow, I thought we already did this?
People call that Déja-vu, where you feel like something has happened before, but it really hasn't. The thing that fascinates me about this is how Déjavu occurs.

Scientist believe its caused by glitches in our memory, which I find impossible. The human brain isn't a computer that random glitches. Scientists also believe if the person has schizophrenia it could be them expierencing memories from the other one?.. -fail- But you know what I mean.

I dont believe that, I think Deja-vu is because of our dreams, haven't you ever had those dreams that you don't remember? Couldn't your concious mind have a slight impression of it, but when something similair happens as to that of your dream, it clicks with you, and you're like "oh my gosh, this has happened before!" And it probably has happened, just in your dreams though.