Descartes, Rene - What is Reality?
Type of Spiritual Experience
A description of the experience
Rene Descartes – Key Philosophical Writings
...when asleep we may similarly imagine that we have another body, and that we see other stars and another earth, without there being anything of the kind. For how do we know that the thoughts that come in dreams are more false than those that we have when we are awake, seeing that often enough the former are not less lively and vivid than the latter?