Jack was looking at Donna, he hoped the Doctor would get a good rest. He knew that he needed that. He did seem to worry about his health as well, he had never seen the Doctor seem to sick. He did still hope he wasn't anything serious. He knew the Doctor was 903 years old, but because the Doctor was a time lord he didn't think the illness was to do with age. Though he knew the Doctor was always busy and hardly sleeping, he figured maybe his body was worn out.

"Ohh... I got some weird signal from the TARDIS and I followed it, figured the Doctor had got himself in trouble, " He explained. Jack was looking at her.
The Doctor was sleeping and was dreaming of various things from his past.