Dreams appear much more prominent and clear when the dreamer is in an unhealthy state - they have an extraordinary semblance of reality. Most monstrous pictures are put together, but all the circumstances are so subtly interwoven, the details so artistically harmonious in every minute respect, as to defy human imitation. Such morbid dreams are always recollected for very long, and produce strong impressions on the disordered and already excited organs of the dreamer.
— Crime and Punishment
by Fyodor Dostoyevsky, translated by Frederick Whishaw