If you dream that you are standing on the edge of a cliff and are afraid, in real life you are afraid of some extraordinary situation in which you are required to make a decision. If you are not afraid, then you will easily overcome all adversity. A dream in which you, being behind the wheel, at a great speed, break from a cliff into an abyss, means that in reality you are involved in a dubious adventure and now do not know how to get out of it. Fighting in your sleep with the temptation to rush down a cliff may be a sign that your mental experience is too heavy and you are on the verge of depression. You need the help of a qualified professional.