Many people who suffer from migraines also suffer from depression, insomnia, or both. The correlation has long since been noted, and this article discusses all three stem from the same cause. Really interesting! http://web.winltd.com/Article.aspx?PageURL=/Pages/English/healthnews/migranes.htm
I also include the link to the article as well as some interesting information the article neglects to mention in my blog (see bottom of page).