After the initial kicking around, Sinclair ignores the majority of the noises that come from Jack. Although a couple times he reconsiders his decision not to wake it up. It seems pretty obvious now that he's having a nightmare, or at least Sinclair is 80% sure of it.

But enough time passes that eventually Jack startles himself awake. Sinclair looks down at him.

"Some dream you were having," he says. Probably the closest he's going to come to showing concern, definitely the closest he's going to come to inviting Jack to talk about it. Especially after last time.