William put his hand on Spencer's back, trying to offer some small comfort. "How long?" he asked, because that was possibly the most important question, how long Spencer had been soldiering on with barely any sleep and none of it restful. The other important question, of course, was, "Is it always the same dream?"
That could help to determine what was going on. If it was about Hogwarts, maybe it was a memory - or the Sight, it would be late-blooming but not impossible, William wasn't ruling it out - but if Spencer was having random terrible dreams, then it might be something else. It might simply be nightmares.