Some of my dreams are fairly short and easily forgettable. Some are really intricate and feel absolutely "real" to the point that they've been the seeds of stories. And then I've had those same vivid dreams, though not quite as intricate, which seem to repeat themselves for a few nights and then don't appear any more. Some of those repeaters were pretty darn good, too, like one where I was Fox McCloud leading not just his flight of four, but entire fighter wings of Arwings into battle against the invading Andross a la Independence Day. Of course, the entire Katina level in SF64 is a blatant ripoff of that film.