oneiro-, oneir-, oniro-, onir-, -neir-

(Greek: dream)

oneiromantic, oneiromancer
Someone who divines by dreams.
oneiromimetic
Resembling a dream as a partly forgotten experience.
oneironaut (s) (noun), oneironauts (pl)
Someone who is said to realize that he or she is dreaming while in the ocean or sea water.
oneironosia, oneironosus
A disease expressed by persistent and unpleasant dreams.
oneironosus, oneirogonos
Morbid dreaming.
oneirophobia (s) (noun) (no plural)
An intense horror of dreaming: Sam was frightened of the nightmares that he had sometimes, which caused him difficulty in going to sleep, and he found out that it was caused by oneirophobia!
oneirophrenia
1. A state in which hallucinations occur, caused by such conditions as prolonged deprivation of sleep, sensory isolation, and a variety of drugs.
2. A form of schizophrenia characterized by a clouding of the consciousness.

Some psychiatrists consider oneirophrenia to be an acute form of schizophrenia.

oneiropolist
Someone who interprets dreams for a price.
oneiropoly
Dealing in the sale of dream interpretations.
oneiropornism
Fantasizing about sex or prostitutes while dreaming.
oneirorgia
Dreams of sexual intercourse.
Oneiros
Ancient Greek personified deities of dreams, who were regarded by Homer as dwelling on the shores of Ocean in the extreme west.
oneiroscopist
A specialist in the analysis of dreeams.
oneiroscopy
Analysis of dreams as an aid in the diagnosis of a person's mental state or other disorders.
oniric
Pertaining to or resembling a dream.

Related "sleep" units: dorm-; hypno-; letho-; narco-; somni-; sopor-.