Normally, Jack wouldn't be caught dead there by the time Tony is back - he's slept in cars his whole life, and even when Sofia gave him a couch (and later, her bed) to sleep in, he always preferred to sleep in his car when he was away on jobs. But his Trans Am is a heap of twisted metal and he doesn't want to look at it again anyway, and he's so tired, so tired. So he stays, and he sleeps in that bed like a scared kid, curled up around himself and hiding his face in his sleeves.

He doesn't plan on it being long enough for Tony to come back, but he's hurting and exhausted, so he'll still be there.