Weird o espaço Dream.....

almost as akward as some of my dreams

Dreams can mean something, or nothing at all. It depends on the way you look at them. I can see meanings in most dreams. Here is my interpertation of why you may have had a dream like this:
About the desert: You may feel alone at the school you attend and often lost. Think about someone riding camelo back searching for water, desperately dehydrated. Now think of yourself as the camel, lugging a heavy load, (Your book bag), through the halls trying to find water, representing your classroom.
About the human aliens: This may represent the uniqueness in people. They look the same on the outside, but have 'alien' personalities..
The book: Representing time. It goes por quickly. The book becoming unavailable segundos later may be telling you that you must reach for what you want within a reasonable amount of time. For instance, you want to audition for a play because theathre intrests you. You need to find the encontro, data for auditions but know its not tomorrow so you procrastinate until the oppurtunity is gone.

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We all have strange dreams but they often can say something =] Though they won't always mean a thing at all.. I once had a dream that a giant salamandra was trying to take over the world. I had to save the dia so I threw a cow at it. Sorry this is long