A dream sequence is a technique used in storytelling, particularly in television and film, to set apart a brief interlude from the main story. The interlude may consist of a flashback, a flashforward, a fantasy, a vision, a dream, or some other element.
A dream sequence in Life of an American Fireman (1903)
A dream is a succession of images, ideas, emotions, and sensations that usually occur involuntarily in the mind during certain stages of sleep. Humans spend about two hours dreaming per night, and each dream lasts around 5 to 20 minutes, although the dreamer may perceive the dream as being much longer than this.
A painting depicting Daniel O'Connell dreaming of a confrontation with George IV, shown inside a thought bubble
Usha Dreaming Aniruddha (oleographic print) Raja Ravi Varma (1848–1906)
A soldier dreams: the trenches of WWI. Jan Styka (1858–1925).
The Knight's Dream, 1655, by Antonio de Pereda