Morpheus is a god associated with sleep and dreams. In Ovid's Metamorphoses he is the son of Somnus and appears in dreams in human form. From the Middle Ages, the name began to stand more generally for the god of dreams, or of sleep.

Dream of the Endless is a fictional anthropomorphic personification who first appeared in the first issue of The Sandman, written by Neil Gaiman and published by DC Comics. One of the seven Endless, who are inconceivably powerful beings older and greater than gods, Dream is both lord and personification of all dreams and stories, and all that is not in reality. He has taken many names, including Morpheus, Oneiros, Kai'ckul, and the Sandman, and his appearance can change depending on the person who is seeing him. Dream was named the sixth-greatest comic book character by Empire. He was also named fifteenth in IGN's 100 Top Comic Book Heroes list.