I shall be arriving in HKG after a twelve hour flight, and will have
four hours to wait for my connection (to SGN). Can anyone suggest a
good place for me to rest? It must be on the airside, because my
ticket rules do not permit a stopover. I shall be flying on Cathay
Pacific in economy (M class): I have already asked about the
possibility of buying an upgrade to Business for the HKG-SGN sector
(to get access to a lounge) but apparently that is not possible.

Any suggestions?