If dreamed you that, floating, you appear in pack of jellyfishes, then in reality you risk to get into an unpleasant situation which will affect in a deplorable way the course of your affairs. If in a dream you watch movements of a big beautiful jellyfish, then in real life you can not always give an adequate assessment to the events. Quite often you are inclined to idealize.
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.