When you sleep under a giant steam catapult and jet fighters landing on the deck, you can sleep through just about anything.
Yes, been there myself, but a FedEx union employee. . .not some hard-working young guy underway doing a man’s work to the point of exhaustion. . .and your son is acclimatized to the bang-clang of aircraft operations off a carrier and working gawd-knows how many hours under all sorts of stress and physical labor. . .that is a far cry from a union guy with scheduled breaks loading packages on a stationary jet on some stable ramp. . .yup. . .gonna wake up mighty fast when the cargo door closes, the engines start, the jet rumbles down the ramp, revs-up the engines for take-off roll and subsequent bumps during said take-off roll, and the steep climb after take-off (noise abatement procedures).
Thinking about this, maybe he didn’t wake up . .drugs, perhaps?