An interesting NYTimes article on why insomnia is a feature of human consciousness:
Wegner and colleagues suggest that this paradoxical thought process can explain a large amount of chronic insomnia, which occurs after we get anxious about not achieving our goal. The end result is a downward spiral, in which our worry makes it harder to pass out, which only leads to more worry, and more ironic frustration. I wake myself up because I’m trying too hard to fall asleep.
One of the paradoxical implications of this research is that reading this article probably made your insomnia worse. So did that Ambien advertisement on television, or the brief conversation you had with a friend about lying awake in bed, or that newspaper article about the mental benefits of R.E.M. sleep. Because insomnia is triggered, at least in part, by anxiety about insomnia, the worst thing we can do is think about not being able to sleep; the diagnosis exacerbates the disease. And that’s why this frustrating condition will never have a perfect medical cure. 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.