NEEMO Monitoring (IMAGE) National Space Biomedical Research Institute Caption Aquanaut Dr. Dave Williams wears an ambulatory monitoring system (sensor vest) to collect physiological data and an Actiwatch (light/motion sensor in a yellow wristband) to monitor his sleep-wake activity patterns and light exposure during the mission. Performance data was collected while aquanauts participated in other activities like observing the remotely-operated vehicle that was being driven by Mission Control in Houston. Credit Photo credit: NASA 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.