Increased Smartphone Screen-Time Associated with Lower Sleep Quality (image) PLOS Share Print E-Mail Caption This is a heatmap of hourly average screen-time scaled by participant. Credit Christensen et al (2016) Usage Restrictions All figures and photographic images will be published under a Creative Commons Attribution License (CCAL), which allows them to be freely used, distributed, and built upon as long as proper attribution is given. Share Print E-Mail 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.