But Percy and Oliver had been up well into Friday morning. Percy had promised to try to sleep at a sensible hour Friday if Oliver would stay up Thursday to study, which they had both thought was a perfectly reasonable solution until they found Friday that Oliver was too nervous to sleep. That meant they'd both had about three hours of sleep in the previous forty-eight hours. The twins, who had been in the process of recovering from spider-related trauma, hadn't done much better. And Stewart Carmichael, one of the Ravenclaw chasers, was in seventh year, taking all the electives, and hadn't had more than four hours" sleep a night in several weeks.