the dreadful dream will symbolize a certain dissatisfaction, fear of any event, the feeling of discomfort pursuing you in reality. If the dreadful dream of the person repeats regularly, it should analyse the situation surrounding it, to pay attention to people with whom he communicates - quite possibly that the situation of the house or in work became the reason of emergence of such dreams.
To learn exact value of a dream, it is worth paying attention to each its detail: the people surrounding sleeping in a dream and also emotion which he experiences in a dream. Most likely,
Be sure and keep any other thoughts out of your mind before drifting to sleep as a cluttered mind can decrease the chances that you will remember your dreams upon waking. Also, focusing on remembering your dreams upon waking in the morning is another very important thing. This sounds very easy, but is often hard for some to do. Interpret a dream by "dictionary dream of interpretation"
When you very first wake up, simply think about your dreams. Don't allow your mind to drift off to other things, just lay there and think about the things you dreamt about the night before - dictionary dream meaning.