Rats With Toys to Keep Them Awake (IMAGE) NIH/National Institute of Mental Health Caption A photo of rats with objects introduced into their cages to keep them awake. Credit Giulio Tononi, M.D., Ph.D., University of Wisconsin-Madison 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.