To dream of going down represents descension, loss, failure, and the worsening of conditions. You may be experiencing lower level of consciousness, negative thoughts, or moving away from goals.
To move down too quickly represents a loss of power, status, or a negative waking life situation.
Moving down may also symbolize becoming grounded, or returning to normal from a very positive or euphoric experience.
Example: A man dreamed of seeing his father fall down basement stairs. In waking life his father's health problems had gotten dramatically worse.