This article was published on the website of Scientific American, on 2003-5-12. download a pdf file of the web article.
An edited version appeared in the print edition of Scientific American, October 2003. Download a pdf file of the print article.
The articles were republished in 2006 in the print and online versions of Scientific American Mind.
The original article, with references, is here: Insomnia handout for Diploma Course teaching.
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