Well, it was probably for the best that the Doctor couldn't sleep. His connection to Jack didn't give him exact dreams, but he got the general feel of them. The emotions that were running through Jack's mind were fascinating. Need, longing, acceptance, and finally nostalgia. Jack was probably older than the Doctor, but he looked impossibly young while he slept.

"It must be nice," the Doctor whispered, moving a lock of Jack's hair aside. "Dreaming just by closing your eyes. You don't know how lucky you are." And while he wanted to get up, to make some tea, to putter about, to look around, he made himself stay still and wait until the morning.

Jack felt happy, like he was home. He wasn't about to ruin that.