Slughorn bids him good night and then he's in the Common Room. It's surprisingly cosy for a dungeon, if terribly austere—high ceiling, statues, paintings. There are very few people up, all of them upperclassmen. A couple of them look up from whatever they're doing, but most don't pay him any mind.

In that case, he decides to go to the first years' dormitory.

How obvious is the way there?

Pretty obvious.

There are three other boys already there and four beds, total. One of the other boys is Sadde, reading. He looks up from his book and sits up. "Hi," he whispers, since the other boys are trying to sleep.

Scott waves, but decides not to disturb everyone else.

"Good night," he whispers, and tries to sleep.

"Good night," he says back, and resumes his reading.