This has happened to me a number of times. It happened twice last night. I was dreaming and i felt like i had that dream before. I knew what would happen before it happend. But i woke up and started to doubt if i’ve ever had it before. This seems to happen to me a number of times. Does anyone know what this means or why? 
When I was a kid, if I remembered past dreams, I would continue them, my mind would “play the next episode”.
But I also had LDs as a kid, so…
my first thought was … recurring dream?
but then you said you doubted you had it before.
it is possible to have false memories in a dream…
the knowing what would happen before it happens, is explained by your thinking of it actually making it happen.
Yeah, what Moogle said 
I think that ND’s are pretty much planned out, so you might know what’s going to happen because that’s the reason it happens.
that always happened to me as a kid…
and if i didn’t like my dream, i’d close my eyes and open them again and it’d be a new dream.
never stopped to think it might be a dream, though…
i thought it was normal. 
well, couldnt it just be de ja vu, but dreaming? and since yyour dreaming and things are quite logical, its harder to rid yourself of it. till you wake, of course