Dream

Dreams are successions of images, ideas, emotions, and sensations that occur involuntarily in the mind during certain stages of sleep. The content and purpose of dreams are not definitively understood, though they have been a topic of scientific speculation, as well as a subject of philosophical and religious interest, throughout recorded history. The scientific study of dreams is called oneirology. Scientists believe that, in addition to humans, certain birds and the majority of mammals also dream.

Famous quotes containing the word dream:

“Chaos was the law of nature; Order was the dream of man.”
—Henry Brooks Adams (1838–1918)

“When you are old and gray and full of sleep,
And nodding by the fire, take down this book,
And slowly read, and dream of the soft look
Your eyes had once, and of their shadows deep.”
—William Butler Yeats (1865–1939)

“Then the bird
breaks with his beak the thread
of dream within him,
and the tree unrolls
the shadow that will guard it
throughout the day.”
—Denise Levertov (b. 1923)