The TARDIS hummed contentedly as the Doctor slept.
The Doctor hated to sleep. To sleep meant to dream. Back before the Time War, dreaming, though not always peaceful, wasn't painful. Time Lords, with their telepathic connections, often entered or experienced each others' dreams. The Doctor was alone in his dreams now. That was why he'd perfected napping—just deep enough and long enough to get the minimum of rest he needed without dreaming. But after he had to take Donna's memories, he hadn't even napped. He'd been pushing himself nonstop until the TARDIS landed on Culloden Moor.
The TARDIS knew the Doctor needed someone to make him take care of himself, but he wasn't in any shape to pick up a new companion and his former companions were 'former' for a reason. Jamie and Zoe had been taken away, though, and of the two, the TARDIS preferred Jamie. Therefore, she took her tired Time Lord back to Scotland.
Once they'd dropped off Victoria, a little early, the TARDIS noted, Jamie had yawned. The Doctor had practically ordered the young man off to bed. Jamie had discerned that the Doctor needed rest, too, and when the Doctor insisted he didn't, Jamie had stubbornly said that he didn't, either. The Doctor wouldn't let lack of sleep be the reason Jamie collapsed somewhere at a vital moment, so he finally gave in.
The Doctor had known Jamie would be watching his room, so he sat down on his seldom-used bed to wait. The TARDIS automatically dimmed the lights and did whatever else she could to make a sleep-inducing atmosphere without the Doctor getting suspicious. Within moments, the Doctor had succumbed.
Once he was satisfied that the Doctor wasn't going to sneak out, Jamie retired to his own room. He didn't require any of the TARDIS' tricks to put him to sleep.
The TARDIS floated serenely in the time vortex, telepathically broadcasting the song of the universe to her sleeping occupants.
A/N: I absolutely love how the TARDIS is portrayed in The Doctor's Wife so I borrow that concept when I write DW fanfic. I love Jamie and Ten, too, so why not put them together?