Sleepy Round Worms (IMAGE) University of Pennsylvania School of Medicine Caption Researchers at the University of Pennsylvania School of Medicine report that the round worm C. elegans has a sleep-like state. Credit Margaret Higgins, University of Pennsylvania School of Medicine 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.