Dreams always have some inner meaning. There are many interpretation about them.
If you see dead people in your dream then it means that you get blessing from them.
If you see Dolphins, it means happiness is around you. There are many inner meaning about different things.
Sometime what you see in your dream happens in real, like i was missing this friend of mine who was absent for a long time. I dreamt that she has come to school, that day itself i could not believe my own eyes, she was sitting exactly like in my dream. Do share with you some of your unforgettable dreams