Hypnos. In Greek mythology, Hypnos is the personification of sleep; the Roman equivalent is known as Somnus.
   His name is the origin of the word hypnosis. Hypnos is the son of Nyx and Erebus.
   His brother is Thanatos. Both siblings live in the underworld or in Erebus, another valley of the Greek underworld.
   According to rumors, Hypnos lived in a big cave, which the river Lethe comes from and where night and day meet. His bed is made of ebony, on the entrance of the cave grow a number of poppies and other hypnotic plants.
   No light and no sound would ever enter his grotto. According to Homer, he lives on the island Lemnos, which later on has been claimed to be his very own dream-island. He is said to be a calm and gentle god, as he helps humans in need and, due to their sleep, owns half of their lives. Hypnos lived next to his twin brother, Thanatos in the underworld. Hypnos' mother was Nyx, the deity of Night, and his father was Erebus, the deity of Darkness. Nyx was a dreadful and powerful goddess, and even Zeus feared to enter her realm. His wife, Pasithea, was one of the youngest of the Graces and was promised to him by Hera, who is the goddess of marriage and birth. Pasithea is the deity of hallucination or relaxation. Hypnos used his powers to trick Zeus. Hypnos was able to trick him and help the Danaans win the Trojan war. During the war, Hera loathed her brother and husband, Zeus,
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