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
Greek mythology in popular culture stories, Percy's ADHD characteristics are explained as being caused by his Olympian blood, thus Riordan was "us[ing] Greek mythology as it has always been used: to explain something that is difficult to understand." In the opera within Girl Genius, the Heterodyne daughter who falls in love with the Storm King is Euphrosynia. The Amazon queen Hippolyta was used as the mother of Wonder Woman in the DC comic book line, At Niagara Falls, the Bridal Veil Falls had previously been called Iris Falls, and Goat Island had previously been called Iris Island as namesakes of the Greek goddess of the