There have been many replies, I'll try to answer them all. For the most part, people seem to believe that its just coincidence (btw, I dont claim that coincidences dont happen, they certainly do. I just dont believe that every single unexplained occurence is a coincidence) because if you do the math, then its clear that occasionally someone will dream something, and it'll happen, so thats it, the crowd can disperse, theres nothing to see here. But heres what I say: in order to reach meaningful conclusions with nothing but mathematical equations, dont you need to have complete knowledge of everything, all the parameters influencing the thing that you are calculating? Is everything known about how the brain functions on the Quantum level, about consciousness, or even about Time itself?
But lets say you know every single factor influencing a rapidly bouncing rubber ball in a large container of some kind. You know the exact wind, airpressure, gravity, mass of the ball and its exact 'bounciness', the material of the container it will be bouncing around in, the force used to throw the ball, all of that, everything. Would you be able ahead of time to successfully calculate and mark with a marker every single point in the container where the ball will make contact with?
Now. How much more complex are the natures of Time, the brain, and consciousness, than a bouncing rubber ball?
Next, lets say all your number crunching regarding dreams is completely accurate, and you can demonstrate that, lets say, every 100,000 dreams will appear to predict something that hasnt happened yet. What do your numbers say about the significance of those occurences? How do you know that what youre calculating isnt that every 100,000 dreams will be some sort of 'psychic' experience? Whats that you say? You dont believe in 'psychic' occurences? Well, thats got nothing to do with your math, thats just youre own belief system talking.
For the record, I dont believe that Im a (for want of a better word) psychic. I just believe that there are more things in heaven and earth, than are dreamt of in your philosophy, uh...Horatio.