1911 Encyclopædia Britannica/Morpheus

MORPHEUS, in Roman mythology, one of the sons of Somnus, the god of sleep. He was a personification, apparently invented by Ovid (Metam. xi. 635), of the power that calls up human shapes (μορφαί) of all kinds to the dreamer. His brothers Phobetor and Phantasus assumed the forms of all kinds of animals and inanimate things.