Don't want to nit-pick SMOC, but it's more like 6pm sign-on, fly, land just before midnight, take off again an hour later & land back in HK about 6am.
Which means IF you've managed to get some sleep at home, then you've woken up at about 3 - 4 pm, and been awake for over 12 hours through the dead of the night.
Safety my arse!