Tracking Sleep (IMAGE) Columbia University Irving Medical Center Caption Activity trackers worn on the wrist kept a log of each research participant's sleep. The data allowed the researchers to determine that a mild sleep deficit, maintained for six weeks, causes changes in the body that raise the risk of developing diabetes in women. Credit Marie-Pierre St-Onge / Columbia University Irving Medical Center Usage Restrictions Credit must be given to the creator. Only noncommercial uses of the work are permitted. No derivatives or adaptations of the work are permitted. License CC BY-NC-ND 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.