Hypnos comes from the name of his Latin counterpart, Somnus. (in- "not" + somnus "sleep"), as well as a few less-common words such as "somnolent", meaning sleepy or tending to cause sleep and hypersomnia meaning excessive sleep, which can be caused by many conditions (known as secondary hypersomnia) or a rare sleep disorder causing excessive sleep with unknown cause, called Idiopathic Hypersomnia. 3D model of "Bronze head of Hypnos" via laser scan of a cast of British Museum's bronze. Hypnos In Greek mythology, Hypnos (; , "sleep") is the personification of sleep; the Roman equivalent is known as Somnus. In the
Libya (mythology) Libya (mythology) Libya (from ) is the daughter of Epaphus, King of Egypt, in both Greek and Roman mythology. She personified the land of Ancient Libya in North Africa, from which the name of modern-day Libya originated. In Greek mythology, Libya, like Ethiopia or Scythia was one of the mythic outlands that encircled the familiar Greek world of the Hellenes and their "foreign" neighbors. Personified as an individual, Libya was the daughter of Epaphus—King of Egypt, and the son of Zeus and Io—and Memphis. Libya was ravished by the god Poseidon to whom she bore twin sons, Belus and Agenor.