how we could know that all our experiences were not just a dream.
because we know when we dream at night for the most part, this idea of a dream that we are constantly inside of seems flawed to me. I say this because I lucid dream a lot, (I actually only recall ever dreaming when it was a lucid dream where I had full control over my actions), and when I remember attempting to sleep in a lucid dream, I either wasn't able to, woke up in reality, or my memory of that dream ended at that point- so what I'm saying is I've never been able to experience dreaming while already dreaming, which is what makes me think that although this reality could possibly be some crazy illusion or simulation, but just pulling from that experience it makes me think that what the author is pointing at is likely impossible