He watched Jack fall asleep. It was an enviable thing, the Doctor believed, being able to sleep so soundly just by closing his eyes. His own body makeup made him either collapse into a trancelike puddle or stay awake for days on end. He could never just fall naturally asleep like this, not without a great deal of blood loss or some sort of sleeping agent thrown into the mix.

He'd watched Jack fall sleep several times before, not the least of which was that time on the luxury ship. Then, Jack's face lost all of its creases and he seemed almost peaceful. This time, Jack's brow tightened and he looked pained as he slept.

"Nightmares, is it?" he asked, too quietly to wake him up. "Yeah, I can understand that. Hasn't been the easiest few weeks for us, has it?"

He pulled his coat a little tighter on Jack's body and placed a hand on his chest while he slept. He wasn't one for holding or snuggling during sleep, but he could...well, he could at least let Jack's subconscious know that he wasn't alone.