You may have to be a NY Times subscriber to access it (I am one so I'm not sure if this will work if you aren't one). It is worth subscribing to just for this article, I believe.
http://morris.blogs.nytimes.com/2009/10/18/the-case-of-the-inappropriate-alarm-clock-part-1/ It's been illuminating. To say the least. Lea babies. they're what i do. www.leamurphy.com