A scary dream can be different types and you need to remind what you have seen in your dream. If you cannot remind the thing of scary, then you will not get correct meaning of the dream. It is not necessary that the meaning of a scary dream has same meaning. If you think too much of anything, then you may see such type of dream. If your environment of sleeping is not perfect like too cold or hot, then you may see such type of dream. If you see you have fallen from large building, then you may be sick and you are weak.