Jack has a fleeting image of Ianto as a kitten, and mentally smacks himself. He sits down on the edge of the couch, withing easy reach, and checks his watch.

"It's pretty late," he says. "So I think tiredness is normal. You can sleep soon; I just have to keep an eye on you. But it's probably best to stay awake for a little while and make sure no other symptoms turn up, okay?"

And make sure he wakes up in the morning.