Sleeping on ISS tough as you want to do more experiments: Shukla
Indian astronaut Shubhanshu Shukla, the first Indian aboard International Space Station (ISS), said, "The most difficult task is to go to sleep because of the time that is around you." He further said, "We know there is limited time, but we want to do more and more (experiments)." However, we need to get rest to do the experiments, he added.