Perhaps the fighters docked with the sleeper ships once they were far enough away from the battle, so the pilots could go bidies too...
there remains the question... who was driving the thing? AI? Heretidary line of navigators and pilots? did they wake people in rotation, so they all did a 6month shift?
No, in the extended opening this lone fighter launched after the sol system was destroyed, long after the sleeper ships were gone.
Unless I'm mistaken, there was an autopilot. It woke the captain and crew when they neared their destination.
