Having worked nights at an ATC centre for many years, I must point out that during the wee hours, traffic may be light, but ATC, certainly where I worked, were not "half-asleep".
The charts which were used on the Horizon programme showed the AoRs of both Kuala Lumpur ATCC and that of Ho Chi Min ATCC, but also implied there was a geographical 'gap' between the areas of responsibility of the 2 centres. If this 'gap' really exists, what is it's purpose, and where are the transfer of control/communication points between the 2 ATCCs?