"But always I shall guard against the mocking and insatiate Hypnos, lord of sleep, against the night sky, and against the mad ambitions of knowledge and philosophy."
H.P. Lovecraft, Hypnos
"HYPNOS was the god or spirit of sleep. He resided in Erebos, the land of eternal darkness, beyond the gates of the rising sun. From there he rose into the sky each night in the train of his mother Nyx."
"Hypnos was depicted as a young man with wings on his shoulders or brow."
"The god is depicted with winged sandals and brow. He holds a yew branch dripping with the somnulent waters of the river Lethe."
Aaron J. Atsma, The Theoi Project: Greek Mythology
"Himself too he bestirred both swift progress and his wind-torn temples [i.e. he had wings on his temples], and filling his mantle's folds with the chill dark air is borne in silent course through heaven, and from afar swoops down in might upon the Aonian fields."