C. elegans under microscope (IMAGE) University of Pennsylvania School of Medicine Caption Caenorhabditis elegans (C. elegans), seen here under a microscope, offer a surprisingly good model for studying the function of sleep in humans and other mammals. Credit University of Nevada, Reno Usage Restrictions None 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.