Hypnos.

Hypnos was the Greek god of sleep and the personification of sleep itself. In most myths, he was the son of Nyx and Erebus, the brother of Thanatos, the husband of Pasithea, and the father of the Oneiroi. He lived with his brother in the Underworld. Hypnos is generally considered to be a benevolent god who helped mortals sleep. Hypnos stated that he hated violence and death, so he would resort to the Eternal Drowsiness to disable his opponents.