Ronald Weasley or Rubeus Hagrid
It was still dark when Ron woke, and he lay there, confused and disorientated for only a moment. Hermione was still asleep, curled up next to him with one hand curled into the collar of his pyjama top. The door swung open and Rose stood silhouetted for a moment before she advanced, dragging her blanket with her.
"Hello, love," Ron whispered as she climbed up, settling into the bed next to him.
"Hugo's awake," Rose whispered, pushing at him as she wriggled her way into the widening gap between them both.
Ron sighed, pushing himself up but he didn't mind.