Vilma Aho, University of Helsinki (IMAGE) University of Helsinki Caption "Our results corroborate the idea that sleep does not only impact brain function, but also interacts with our immune system and metabolism", researcher Vilma Aho states. Credit Linda Tammisto / University of Helsinki Usage Restrictions The image may only be used with appropriate caption and credit. 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.