text: In Greek mythology, the Oneiroi or Oneiri (Ὄνειροι, "Dreams") were, according to Hesiod, sons of Nyx (Night), and were the brothers of Hypnos (Sleep), Thanatos (Death), Geras (Old Age) and other beings, all produced via parthenogenesis Cicero follows this tradition, but describes the sons of Nyx as fathered by Erebus (Darkness).