We are traveling from SFO to HK on Singapore airline with a 1am departure time. We took this flight when our twins were two months old and it was a breeze because they were still in that sleepy newborn stage.

This time the twins will be 14 months old and they have been sleep trained to sleep from 8pm to 7am since five months old. I'm so worry and scared to interrupt their sleep for this travel. How should I do it to make this trip as smooth as I can for the twins?

Should I go to the airport early so they can settle and sleep on their stroller at the lounge ? Or just keep them awake as long as we can till we get to the airport in late evening but risk having both babies get very fussy from being overtired!