Morpheus ('Fashioner', derived from the Ancient Greek: μορφή meaning 'form, shape') is a god associated with sleep and dreams. In Ovid's Metamorphoses he is the son of Somnus and appears in dreams in human form. From the medieval period, the name began to stand more generally for the god of dreams, or of sleep.

What does Morpheus mean?

: the Greek god of dreams.

What is the name of the god of sleep?

Hypnos, Latin Somnus, Greco-Roman god of sleep. Hypnos was the son of Nyx (Night) and the twin brother of Thanatos (Death).