It was explained that what happens in the physical world to the dreamer can affect his dreams. For example, if if it is very hot, the dreamer might dream about a desert or a beach. If it is cold, a snowy scene. While the people were in the van dreaming, it was on free fall so it seemed to the dreamer as if there was not gravity. This affect only extends to one more level of the dream, the hotel room, and does not extend to any further levels.
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