light therapy en Researchers try to individualize light therapy <p>As upstate New York heads into some of the darkest days of the calendar year, researchers at the Rensselaer Polytechnic Institute in Troy are trying to shed some light on our individual cycle of sleeping and waking known as the circadian rhythm. Fri, 23 Nov 2012 21:04:04 +0000 Marie Cusick 29571 at