Dreaming of someone whistling insinuates that people with unknown or hidden interests will try to harm the dreamer. Dreaming of someone whistling may mean that youll soon reach the success that you have been waiting for. This same dream in a young woman suggests that her behavior is indiscreet, which wont allow her to get the things she wants the most. If a whistle appears in our dreams, whether you hear it or not, it is often a symptom of possible disease. If you dream that the whistle is used, it is a sign that you have perceived that theres danger surrounding you and it wont be easy to triumph over your enemies.