Sleeping Fish (IMAGE) PLOS Caption Infrared picture of an adult zebrafish (Danio rerio) sleeping at the bottom of its aquarium. Credit Mignot et al. Usage Restrictions All material published by PLoS is subject only to the condition that the original authorship and source are properly attributed. 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.