Toddler and Puzzle (IMAGE) University of Colorado at Boulder Caption Toddlers who miss naps show decreases in joy, interest and understanding when asked to work picture puzzles. Credit Photo courtesy University of Colorado 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.