How Do You Explain Déjà Vu?

When we experience déjà vu, we feel something which is happening has happened before and I'm not sure if this involves different time dimensions, since it essentially involves memory, which is of the past. I like the theory that déjà vu is concurrent memory and consciousness of a single situation. It is thought that the brain races forward and acquires information before it enters consciousness, so informationally, in the brain, there is a memory. When we then become conscious of the situation, the brain matches this with what has become a memory as far as the brain is concerned — since it rushed forward. We then have both a memory and consciousness of a current situation.