Just because the person is so immersed in a dream that it is impossible for him to recognize the disparities between these 2 experiences, this same person can nevertheless make a difference. once he or she wakes up. Furthermore, a sensation as clear as pain cannot be the same as the pain we feel when we wake up, some argue. After all, Descartes' premise is based on the idea that there is nothing in reality that a dream cannot reproduce so vividly that we are unable to tell the difference. But he also said that dreams in a sense borrow some things from reality, but not all, so they may just be somewhat plausible events, made up by our imagination.