In Ovid's Metamorphoses, Phantasus (Φαντασος (Phantasos, "fantasy"/"apparition") was one of the Oneiroi (the deities of dream), the sons (triplets, sometimes simply the most prominent three of many) of Hypnos (god of sleep) and Pasithea (goddess of relaxation, meditation and hallucinations), (or Nyx (goddess of night) and Erebus (god of darkness)).