Hypnos is a character from the anime series Saint Seiya. He is the Greek god of sleep and serves as one of the twin gods under the command of Hades, the main antagonist of the Hades arc. Hypnos is known for his calm demeanor and immense power, capable of inducing eternal slumber. He plays a crucial role in the series by opposing the protagonists, the Bronze Saints, as they strive to rescue Athena and defeat Hades. Hypnos's loyalty to Hades and his strategic mind make him a formidable adversary.