Dreams about loss are, as a rule, prophetical. It is possible where you expected success, you are trapped by failure. If dreamed you that you lost someone from friends or relatives, then you should be ready to the fact that even very carefully planned operation can break because of nonsense.
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.