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
Twins in mythology In Zoroastrian mythology, the twins Ahriman and Ahura Mazda represent the spirits of evil and good. Good and evil are common conflicting personas within twins in mythology. We see this pattern across many cultures, such as several northeastern Native American tribes, for example. Gluskap, the creator God and cultural hero, had to defeat Malsum, his evil twin, who was the ruler of the demons. Many other cultures with rival twin heroes often follow this structure of split moral forces. Twins can also be shown as having special powers and deep bonds. In Greek mythology, Castor and Pollux share a bond