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
Metope (mythology) Metope (mythology) In Greek mythology, Metope (Greek: ) was a river nymph, the daughter of the river Ladon. Her waters were near the town of Stymphalus in the Peloponnesus. She married the river god Asopus by whom she had several (either 12 or 20) daughters, including Aegina, Salamis, Sinope, Euboea, Tanagra, Thespia, Thebe, Corcyra, Ismene, and Harpina; and possibly sons, including Pelagon and Ismenus. The question of the exact parentage of these children of Asopus is very vague. She may or may not be identical to Metope, consort of the river god Sangarius. Some say these were the possible parents