“I am accustomed to sleep and in my dreams to imagine the same things that lunatics imagine when awake.”
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René Descartes 47
French philosopher, mathematician, and scientist 1596–1650Related quotes

Before the Flowers of Friendship Faded Friendship Faded (1931)
“When I am asleep, I dream what I dream when I am awake. It's a continuous dream.”
Durmiendo sueño lo que despierto sueño. Y mi soñar es continuo.
Voces (1943)
“I see nightmares when I sleep and I dream about you when I'm awake.”
This quote is from "Pink" by "Rymin" and the original words are in Persian.
Source: https://soundcloud.com/rymiin/pink

“The lunatic, the lover, and the poet, are of imagination all compact.”
Source: A Midsummer Night's Dream

“Why does the eye see more clearly when asleep than the imagination when awake?”
The Notebooks of Leonardo da Vinci (1883), XIX Philosophical Maxims. Morals. Polemics and Speculations.
Variant: Why does the eye see a thing more clearly in dreams than with the imagination being awake?

1920s, Viereck interview (1929)