Quite like being chased, dreaming of falling indicates you have feelings of insecurity and anxiety in waking life.
You could feel out of control in a waking life situation, it could be in a relationship, work situation or just in your general approach to life.
Similarly these dreams could indicate that you are indulging in some form of self-destructive patterns of behaviour.
It could also express feeling like a failure in some aspect of your waking life.