Corresponding author and wearable device (IMAGE) University of California - San Diego Caption UC San Diego PhD student Varun Viswanath is the paper's corresponding author. The researchers analyzed data from the Oura ring, a smart wearable that tracks temperature, sleep and other information. Credit David Baillot/University of California San Diego Usage Restrictions Please credit License Original 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.