Harry wakes up from his vivid dream, in pain from his burning scar. He tries to recall his dream, remembering Wormtail and Lord Voldemort and another person. He tries to distract his mind with Flying with the Cannons but even that doesn't work. He doesn't know who to tell about what happened. Hermione would tell him to go straight to Dumbledore and consult a book like Common Magical Ailments and Afflictions. Sudenly he knows who to consult. He writes a letter to Sirius.