Humans have two primary states of consciousness: waking and dreaming.

Humans have two primary states of consciousness: waking and dreaming. Rene
Descartes, in his Meditations on First Philosophy, argues that we cannot know
whether or not we are dreaming. So, how does one know whether one is awake or
dreaming? Is our perception of being awake or dreaming a reliable source of
knowledge? Why or why not?

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