To be honest each song has multiple meanings, all depending on how you wish to look at it. In my oppinion this particular song is about a man who lost his chance with his love, whether by breakup or death. He is saying he longs for the chance again to be with her (last song last dance, but i don't get you back don't get another chance) He is singing about the way he feels when he thinks of her, how he doesn't want to wake up when he dreams of her because she meant the world to him.