No overnight flights in Y rule some options I can think of, such as my upcoming trip: MEL-KUL on EK (QF codeshare) dep 02:40am, then KUL-HKT on MH, and HKT-USM on PG.
You could take the MH day time flight MH148 MEL-KUL, arriving approx 9pm, overnight in KL then connect to direct PG flight...