I used to get it very frequently as a child. At the time, I thought it meant I had had a prophetic dream. And then I would try to change it, by doing something unexpected, but it never worked -- I would immediately believe that I had dreamed that too.

But I accept the theory that it's just a mis-timing in my brain -- that seems to explain everything about it, at least the experiences I've had.

So what prompts the question?