I don't think I've ever had the same dream twice, but I know I've had dreams that were in sequence like episodes to a show. I'd have a dream, and then a few weeks later I'd have a dream that had a few parts from the first dream, and then more added towards the end of the dream. All through the dream I'd be thinking "This seems so familiar." Only after I woke up did I realize it was part 2 of that one dream I had weeks ago.
I find dreams to be so fascinating. Some dreams even seem to be influenced by what's going on in the real world. Such as, something you do throughout the day will happen in your dream (seems like stuff just before you go to bed has more of an influence). So, if you were watching the Military Channel just before you went to sleep, you might have a dream about war.
Anyone else think that dreams are a way of your subconscious trying to tell you what you may be seeking in life, or how to better you life style?