The Sleep of Reason Produces Monsters is an etching by the Spanish painter and printmaker Francisco Goya. Created between 1797 and 1799, it is the 43rd of 80 etchings making up the suite of satires Los Caprichos.
The full epigraph for capricho No. 43 reads:
“Fantasy abandoned by reason produces impossible monsters: united with her (reason) , she (fantasy) is the mother of the arts and the origin of their marvels.”