Greek sleep deities

In Greek mythology, Hypnos (; Ancient Greek: , 'sleep'), also spelled Hypnus, is the personification of sleep. The Roman equivalent is Somnus. His name is the origin of the word hypnosis. Pausanias wrote that Hypnos was the dearest friend of the Muses.

thumb|Morpheus, painted by Jean-Bernard Restout Morpheus ( 'Fashioner', derived from , meaning 'form, shape') is a god associated with sleep and dreams. In Ovid's Metamorphoses he is the son of Somnus (Sleep, the Roman counterpart of Hypnos) and appears in dreams in human form. From the Middle Ages, the name began to stand more generally for the god of dreams, or of sleep.

thumb|"Nestor Appearing in a Dream to Agamemnon" (1805) by Henry Fuseli

thumb|272x272px|Phantasos on the western corner of the Dresden Academy of Fine Arts by Robert Henze In Ovid's Metamorphoses, Phantasos (, 'apparition' 'fantasy' from , phantasíā, 'appearance' 'imagination') is one of the thousand sons of Somnus (Sleep, the Roman counterpart of Hypnos). He appeared in dreams in the form of inanimate objects, putting on "deceptive shapes of earth, rocks, water, trees, all lifeless things".

In Ovid's Metamorphoses, Phobetor (, from ), so called by humans, or Icelus/Icelos (), so called by the gods, is one of the thousand sons of Somnus (Sleep, the Roman counterpart of Hypnos). He appeared in dreams "in the form of beast or bird or the long serpent".

Brizo (Greek: Βριζώ) is an ancient Greek goddess who was known as the protector of mariners, sailors, and fishermen. Brizo was also known as an oracular goddess specializing in oneiromancy.

In Greek mythology, Epiales () was the spirit (daemon) and personification of nightmares. Alternate spellings of the name were Epialos (Ἠπίαλος), Epioles (Ἠπιόλης), Epialtes (Ἐπιάλτης) or Ephialtes (Ἐφιάλτης).