http://articles.mercola.com/sites/articles/archive/2000/11/12/sleep-driving.aspxMany people who get sleepy while driving have undiagnosed nighttime breathing disorders, new study findings show. Researchers found that about 1 out of every 30 drivers regularly felt sleepy while driving on the highway , corresponding to a 13-fold increaseenCommunityServer 2008.5 SP1 (Build: 31106.3070)