[He's encouraged by his reaction, at least, keeping his voice soft as he sings to him-- he doesn't expect him to actually fall asleep, but if he can at least relax and rest? That's a good thing. And focusing on this keeps him from his own mind wandering to the bad dreams. When he finishes up the song, he pauses for a moment, lifting one hand to curl gently in his hair, petting absently, and then slips easily into another song.]