I had a midterm question where this was relevant, essentially it was:
"Assuming you're an atheist, how would you prove to Descartes that your last vacation wasn't a dream?"
I put that since Descartes believes in God, your beliefs are irrelevant and since God is not a deceiver (according to Descartes), he would not deceive you into thinking your experience was a dream. But that wasn't right. So I'm trying to figure out what the answer was.
I've only seen statements and analyses of the problem he poses in First Meditations, not the resolution to the problem.
Can anyone summarize for me his proof?