"I become possessed by an intense, overpowering sense of sadness, that in my then sickly, nervous state produced a mental condition adequately to describe which would take a great physiologist. I could not sleep, I lost my spirits, my favourite studies became distasteful to me, I could not work, and I spent my time wandering aimlessly about Paris and its environs. During that long period of suffering I can only recall four occasions on which I slept, and then it was the heavy, death-like sleep produced by complete physical exhaustion."
- Hector Berlioz [1803-1869]
