The most enjoyable writing experience I have ever had was when I began writing short stories for a while, when I was in my early 20s. Those strange dream-like stories mostly came to me at nights when I was asleep. I used to visualize them first in my dreams. Then if I could remember them after waking up, I wrote them down before I forget them. This should happen in darkness for two reason: first I didn’t have time for turning on the light —since I could forget them in any moment, and secondly turning the light on could ruin the dream-like images I had in mind and consequently ruining the dream-like feeling for transforming those images into the right words.
The funny part was the next morning, when I had to decipher what I had written and remember what I have meant by those words.
The Dream, 1910. By Henri Rousseau.