Deipnosophists

Licymnius of Chios, after explaining that Sleep was in love with Endymion, says that Sleep does not cover the eyes of Endymion when he slumbers, but lays his beloved to rest with eyelids wide opened, that he may enjoy the delight of gazing upon them continually. His words are: "Sleep, joying in the light of his eyes, was wont to lay the boy to rest with lids wide open."