Hi Sara
Welcome to Poms in Oz,
Please allow me to introduce you properly to Aldo. Please click on the link below and then follow the link to the Horror Flick. It reveals (amongst other things) thatAldo's children survived the journey to Oz!
http://www.pomsinoz.com/forum/queens...adventure.html
Aldo was only having you on, as you no doubt realise.
Seriously, though, do not give the children anything which might make them drowsy because it might de-hydrate them as well, and also you can't have floppy, semi-comatose children in case of an emergency.
As Ali said, they will sleep when they are tired anyway and if the flight is not full, the cabin staff are usually good about helping to convert spare seats into beds for the babes.
I would take sweets that they can suck during the descents into Hong Kong & Perth because both are both quite steep because of the hills nearby. As a result, the cabin pressure is altered pretty quickly during it. This used to give me acute earache when I was a child, flying back & forth between the UK and Malaysia the whole time, and sucking boiled sweets helps to make one's ears 'pop' to reduce the pressure. I sometimes still get this earache whe flying even now and the sweets still help.
The planes all, always, carry boiled sweets for any passenger who wants them. However, their choice of sweets may not be the ones your children would choose!
You can also order children's meals if you pre-book them in advance. With Cathay Pacific, these might even be loaded into the plane!
Best wishes
Gill