Source : Webster's Revised Unabridged Dictionary (1913)

Morpheus \Mor"pheus\, n. [L., fr. Gr. ? prop., the fashioner or
   molder, because of the shapes he calls up before the sleeper,
   fr. ? form, shape.] (Class. Myth.)
   The god of dreams.

Source : WordNet®

Morpheus
     n : the Roman god of sleep and dreams