"You probably should," Zhaan says. "Monitoring sleepers and waking them up in the event of a nightmare is all we can do, though. Fortunately cots have been set up in what used to be the staff gym, with people on duty to watch. Anyone who fears being attacked can stay there."

Her work with the fuser done, Zhaan deactivates it. "Let me get a hand scanner and make sure you suffered no other damage - just in case."