I'm having a 3 day EEG done today to determine if I'm having simple partial seizures, but this sounds like something I experience more often than not. I wake up and the dream is just like dejavu and I swear I've had it more than once and even back into my childhood it seems. So I know the feeling, but of course don't know if it's just a dejavu feeling from dreaming and having a seizure during that time or if I really have had that dream before. But...I do know what you mean.