Under JARs, only time in the seat can be logged if not in command.
BAU, why should it be civilised logging time when asleep in the bunk? It's meaningless. Under JARs, you can only log time where you are doing your job. Don't get confused between logging time and duty hours. A 14 hour sector between Hong Kong and London may only achieve 8 hours logged, but the duty time would be the full 14 hours for flight time limitations and pay.
And I would hardly call some of the horrific times you can work under some of the FARs civilised.