OBE Experiences

[NickThissen]

Dreams are strange like that, you can never truly remember a dream and often if you think back on it you think you can remember it but in fact you're thinking something completely different. It is much more likely that during your real exam you thought that you dreamt it already, but that is just a false memory and your actual dream was you chasing a unicorn (but you just can't remember that).
As Shaggy says, the only reliable way to test this is to write down your dreams immediately.

I've had this myself a couple of times, where I witness something and then think "Huh? I've had a dream like this yesterday!", but how can one verify that I actually had that dream? I probably had a completely different dream and just don't remember it, and for some reason my brain makes me think I dreamt something else.

I guess it's similar to deja-vu. I've had deja-vu's in places where I've never been before, and I could 'remember' all kinds of details about the place.