dream vision
/ˈdriːm ˌvɪʒn/noun
1The action or fact of seeing someone or something in a dream, especially as a form of prophesy. Also (now chiefly): an instance of this; a vision experienced in a dream.
2A narrative mode, chiefly associated with medieval poetry, in which the author recounts an alleged dream, the subject of which is typically open to allegorical interpretation.
Origin
Early 18th century. From dream + vision.