Have slowly been changing to San Francisco's time zone whilst in HK. It involves, amongst other things, being consistent with the times at which I consume alcohol.
Therefore, though it's 10am in the airport, I shall have a burger and cocktails because it's 6pm in San Francisco and I have 2 hours before boarding. Slept exactly 3 hours last night after a nice workout in the gym, so should be sufficiently exhausted to actually fall asleep on the plane.
(Allocated extra travel time in case the morning protests affected the airport route. All clear though.)