Well, according to the Bible if you had the same dream twice, it means that it will happen. I read this in one of the books of Neville (I don't recall now which one), but I was interested in the same question a couple of months ago and looked up that Bible verse.
Here it goes:
"And for that the dream was repeated unto Pharaoh twice; it is because the thing is established by God, and God will shortly bring it to pass." Genesis 41:32