Rose was annoyed when the Doctor nodded off during her favourite movie. She elbowed him in the ribs, but when he woke and looked at her, sleepy and confused, she smiled, pulling his head onto her shoulder. He sighed and slept again. Hard to think of him needing nearly as much sleep as her now that he was half human. Hard to think of him being half human at all, come to that, although, Rose surmised, a little sadly, "That's the half that keeps him here."
She decided not to think of that at all, and just enjoyed their togetherness.