Abstract
One big philosophical question is to know whether we know anything or not. Knowing in a sense is quite different from its everyday use. As a matter of fact everyone claims to know various things all the time, but the conditions that are required to say that we know in everyday life are quite different from the ones that are required to say that we really know something in the epistemological way. Epistemology does provide us with different theories to know the truth (coherence, correspondence theory, foundationalism etc.). In this essay, I will use two (related methods) to see whether or not one can know he is not dreaming. The dream-argument comes from Descartes' meditations. For him, there is no sensible difference (in the way that we cannot feel it) between the awake stage and the asleep one. In this essay, I will however not keep this assumption, for I do not agree with it and I still feel it is worth it to see whether we can say that we know that we are not asleep once we have made the basic assumption that there is a difference between the two stages.
