When you are standing on the ledge in your dream, then such dream symbolizes the tension, chaos and agitation. If you saw someone else standing on the ledge, then it means you should give a hand for that particular person, because he is lost and needs help. The dream about the ledge could have both negative and positive meanings, depending on where you are looking at while standing on it. If you looked up, then it means you have high expectations, but if you looked down, then it means you are feeling lost and depressed.
Read more about dreaming of Ledge in other dream meanings interpretations.