Nyx

Night, born of Chaos with Erebus in Hesiod; mother by Erebus of Aether and Day, and without a mate of Doom, Death, Sleep, the Dreams, the Fates, Nemesis, Strife and the rest of the dark brood. Her house stands by Tartarus, where she and Day pass each other at the threshold; even Zeus, says Homer, feared to displease her.