Sora was still curled up in his bed in the dark. He'd been falling in and out of sleep, and mostly when he woke up he'd start thinking awful things and start crying again, or feel sick, and eventually his head would hurt and he'd go back to sleep.
He might have heard the knock on the door, or Riku's voice. He might not have heard it at all. Either way, he didn't respond, except to pull the blanket more over his head.