http://articles.mercola.com/sites/articles/archive/2008/01/02/light-on-knees.aspxA new study suggests bright light shining on the back of the knees can help set the body's 24-hour internal clock, The findings demonstrate there is literally more than meets the eye when it comes to using bright light for changing the circadian clockenCommunityServer 2008.5 SP1 (Build: 31106.3070)