Sleep-Deprived Worms (IMAGE) University of Pennsylvania School of Medicine Caption David Raizen, M.D., Ph.D., assistant professor of Neurology in the Perelman School of Medicine at the University of Pennsylvania, and his colleagues report in Current Biology that even in Caenorhabditis elegans, a tiny nematode worm that feeds on bacteria, loss of sleep is "stressful." Credit David Raizen/Penn Medicine Usage Restrictions Credit David Raizen/Penn Medicine License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.