In Greek mythology, the Oneiroi were the sons of Hypnos, the god of sleep. They were personifications of dreams—black-winged daemon—and were said to live on the shores of the Ocean in the far West, in a cavern near the border of Hades. The gods sent dreams to mortals from one of two gates located there: true dreams emerged from a gate made of horn, whereas false dreams threaded their way from a gate fashioned of ivory. They are described in the Odyssey, Hesiod's Theogony, and Ovid's