Probably just that there is something that has been on your mind for sometime.
All dreams are a great series.
Nothing, absolutely nothing. It probably results from you being creative.
Well, all you have to do is win 4 of the dreams and you win the series and become world champion dreamer!
Really, dreams come from withing our mind. As LordR1160 said, something is on your mind - and you are having trouble dealing with it. Our subconscious mind doesnt allow us to dream of exactly what it is most times, but encodes the dream. For example, if there is a truck in your dream, it is a symbol for something else deeper(most of the time). You must have an idea of what is bothering you?? I
You are studying at a higher level an issue in which you are preparing yourself to undertake. Crash course, so to speak.
Lots of info being given you in a short period of time.