Weird 宇宙 Dream.....

almost as akward as some of my dreams

Dreams can mean something, または nothing at all. It depends on the way あなた look at them. I can see meanings in most dreams. Here is my interpertation of why あなた may have had a dream like this:
About the desert: あなた may feel alone at the school あなた attend and often lost. Think about someone riding キャメル, ラクダ 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 によって quickly. The book becoming unavailable 秒 later may be telling あなた that あなた must reach for what あなた want within a reasonable amount of time. For instance, あなた want to audition for a play because theathre intrests you. あなた need to find the 日付 for auditions but know its not tomorrow so あなた 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 サンショウウオ, サラマンダー was trying to take over the world. I had to save the 日 so I threw a cow at it. Sorry this is long