SLEEP 2010 will begin in about three hours at 8 a.m. Central Time at the Henry B. Gonzalez Convention Center in downtown San Antonio. Look for live coverage all day right here at the Sleepeducation Blog.Today's plenary session features a keynote address by Derk-Jan Dijk, PhD, a professor of sleep and physiology at the University of Surrey in Guildford, England and the director of the Surrey Sleep