According to Descartes, the experience of a dream may theoretically be indistinguishable from waking life.
Descartes subscribes to the rational theory that dreams, which routinely occur in everyone, are a series of experiences that frequently resemble those we encounter during the day. Because we are unaware that we are dreaming while they are happening, dreams give the dreamer the impression that they are acting in real life. Descartes asserts that, notwithstanding any apparent subjective differences between waking life and dreaming, these differences are insufficient to establish with certainty that I am not dreaming right now. In his view, the experience of a dream may, in principle, be indistinguishable from waking life.
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