Chinese philosopher Zhuang Zhou once dreamed he was a butterfly. When he woke, he observed, “Am I a man who dreamed he was a butterfly or a butterfly who dreams it is a man?” And so, the epistemological question is this: how do we know that reality is not a dream?
I’m going to offer this response: reality is not riddled with continuity errors, but dreams are. For example, the other day I dreamed I was swimming in a pool when I saw a battery on the bottom of the pool. I reached down and grabbed it. But when I pulled it out, it had become a pair of scissors. Classic continuity error. If that happens to you, you’re dreaming. By contrast, if your reality evinces enduring stability and continuity, you’re likely awake.
Enduring philosophical problem solved!