http://articles.mercola.com/sites/articles/archive/2004/02/18/insomnia-eyes.aspxScientists have found that lack of sleep can be due to eye diseases, which cause people to have difficulty using daylight to synchronize their internal rhythms to the outside world. It has been found that daytime napping is a sign of disturbed sleep atenCommunityServer 2008.5 SP1 (Build: 31106.3070)