A recent study found that "Oklahoma, Arkansas, Mississippi, Alabama and West Virginia had the highest rates of sleep disturbance and daytime fatigue"
I suspect that the high rate of sleep disturbance and fatigue in the south is due to obesity, a major risk factor for obstructive sleep apnea
Read more: http://www.foxnews.com/health/2012/02/24/southerners-sleepiest-in-us-study-says/#ixzz1nOmzb4lX
I will try to post a link to the actual research study later. As a southern sleep doctor (currently licensed in Mississippi and Alabama, formerly licensed in West Virginia), this topic is of concern to me.