Who is Morpheus?

Morpheus, in classical mythology, is the god of dreams. His name means "He Who Forms or Molds." Morpheus is known as "the fashioner or molder" because of the shapes that he calls up before the sleeper. He is the son of Hypnos, the god of sleep. He is hardly every mentioned in the stories of the gods, and he was not a god that was worshipped. It is possible that his name actually meant "Dark." Today, children know him as the "Sandman." It is said that he flew with soundless wings.

Hypnos (sleeping) and his son Morpheus (with wings)

The House of Somnus

Near the Cymmerians, in his dark abode,
Deep in a cavern, dwells the drowzy God;
Whose gloomy mansion nor the rising sun,
Nor setting, visits, nor the lightsome noon;
But lazy vapours round the region fly,
Perpetual twilight, and a doubtful sky:
No crowing cock does there his wings display,
Nor with his horny bill provoke the day;
Nor watchful dogs, nor the more wakeful geese,
Disturb with nightly noise the sacred peace;
Nor beast of Nature, nor the tame are nigh,
Nor trees with tempests rock'd, nor human cry;
But safe repose without an air of breath
Dwells here, and a dumb quiet next to death.

An arm of Lethe, with a gentle flow
Arising upwards from the rock below,
The palace moats, and o'er the pebbles creeps,
And with soft murmurs calls the coming sleeps.
Around its entry nodding poppies grow,
And all cool simples that sweet rest bestow;
Night from the plants their sleepy virtue drains,
And passing, sheds it on the silent plains:
No door there was th' unguarded house to keep,
On creaking hinges turn'd, to break his sleep.

But in the gloomy court was rais'd a bed,
Stuff'd with black plumes, and on an ebon-sted:
Black was the cov'ring too, where lay the God,
And slept supine, his limbs display'd abroad:
About his head fantastick visions fly,
Which various images of things supply,
And mock their forms; the leaves on trees not more,
Nor bearded ears in fields, nor sands upon the shore.

Ovid, Metamorphoses, Book XI (1 A.D.)