There have been several nights where Hermione has needed to awaken Malfoy from nightmares since...the incident, because once Malfoy was lucid enough to do so, he began to refuse the Dreamless Sleep potion. He says that it makes him feel wrong, but Hermione thinks he's being an idiot and a masochist, and has told him so in no uncertain terms. Not that her telling him so has swayed him on the matter. He is as stubborn as her, a fact she doesn't entirely dislike, until times like this.