Whatever you do don't fall into the trap of ending "and he woke up, found it was a dream and lived happily ever after". It is so cliched!
Here are some suggestions of how to approach the problem. Is there something you feel strongly about as an issue? I'm sure there is! Try and think of how you can weave this into a story involving a dream and real life. How could you get your message across? What techniques could you use?
An idea that occurs to me is that you could use contrast to make your point. The dreams could be the contrast of what is happening in real life. Something good might be happening in real life while something unpleasent might be happening in the dreams, or vice versa. It might be interesting to constantly flip between the dream and real life.
Think about the kind of ending you want. Does the dream become reality so that the dream and reality are one, or does the dream and reality diverge (become more distant frome aech other?)
Remember to use other techniques such as imagery etc.
I won't say anything else, but I hope that helps you think of something