Who is The Sandman/Oneiros/Morpheus from The Sandman and what is their importance?

The Sandman is Morpheus, the god of dreams. He is one of the few gods who has not disappeared, because he is eternal. Although the Sandman is a supernatural figure with power over people's minds, he is also a person with his own motives. In "Calliope," the Sandman shows pity and understanding for Calliope. Even though she has hurt him in the past, he forgives her. He is repulsed by Madoc's self-centered behavior and willingness to degrade another being for his own benefit.