what if this is all a dream?

Some years ago had a dream that I still remember, because I dreamed that I was dreaming. In my dream woke up and discovered that I had overslept and that I had missed my exam. Then I woke up (still in my dream) and I realized that I wasn't late for my exam, there was still plenty of time. Then I woke up in real life and I realized that there was no exam, everything was just a dream. But the dream made me think about my life in a different way, and it made me wonder if I will wake up one more time and discover that the life I live today is nothing but a dream It reminds of the famous a quote that you might know: "Once I dreamed I was a butterfly, and now I no longer know whether I am Chuang Tzu, who dreamed I was a butterfly, or whether I am a butterfly dreaming that I am Chuang Tzu."