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Re:Show HN: Sleepio - how I cured my insomnia, turned into s... by bpaluzzi on Tuesday September 11, 2012 @06:58AM (#4504731)
"Most widely used" seems a bit strong... https://www.google.co.uk/search?q=cbt

(just in the interest of full disclosure, I'm the lead developer for Sleepio)

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