Abstract
To answer the question whether I am dreaming or awake, and whether there exists an outer correlate of my representations while awake, I consider the meaning of dreaming and wakefulness in Calderón and Descartes. Then I consider the nature, origin, limits, and function that each author gives to doubting. Before concluding, I reconstruct Calderón’s and Descartes’ arguments through which the dramaturge and the philosopher somehow recover that which they previously considered realistic certainty