Nobody dares deny that dream ideas act in so powerful a manner upon the dreamer's mind as to give him the feeling of all that intensity and reality of experience which he possesses during the waking state. People are plainly seen; objects are solidly felt--as much in one case as in the other. The powerful effects of a very vivid dream will sometimes be remembered for days afterwards. And who that has experienced that awful form of dream called the nightmare can find any waking experience which can surpass it in intensity, in immediacy, and in actuality? Yet the same experiences which are accepted as being so real during dream are repudiated as being so unreal after waking! When we consider that this same paradox holds good of all the millions of dreamers throughout the world, we must indeed admit there is something wholly mysterious and momentous in it.
-- Notebooks Category 19: The Reign of Relativity > Chapter 3 : The States of Consciousness > # 39
