Insomnia is ultimately a side-effect of our consciousness, the price we pay for being so incessantly self-aware. It is, perhaps, the quintessential human frailty, a reminder that the Promethean talent of the human mind -- this strange ability to think about itself -- is both a blessing and a burden.
Insomnia : The Frontal Cortex
I think I am going to subscribe to this blog on LJ. I found it via this article on depression that he wrote for the New York Times.