Human beings have two ancient primal fears: fear of falling, and fear of loud noises. Dreaming of falling often implies the fear of losing control and resulting disaster.
If the dreamer falls a great distance, then he should start finding solutions right away, for there is danger of severe complications.
If the dreamer falls a short distance and is unhurt, the damage will be minimal and can easily be set right.
A pun: Something important will happen, or difficulties will be resolved, by the “fall” (autumn).
Astrological parallel: Scorpio Tarot parallel: The Tower