Emergency

In dreams, if you see a siren blowing, it means in your real life there are some pending matters that immediately require your attention and you must attend to it after waking up. You may have missed something and that is what your dream is reminding you of.

Also, it may mean you are about to face a new problem which will form a new lesson that you shall learn in your field or relations. Perceive it as a warning, that only you can see and hear.