night toilet training and waking them for trips to the toilet

[Smoke Jaguar]

That's true, too.
I would have thought it preferable, though, to help activate awareness and reconnect the messages between the sphincter and conscious mind (being that babies are born knowing they need to go and we train them out of it by putting nappies on them - no individual judgment, I did it with my first, because of cultural assumption!), rather than to delay this internal communication by achieving dryness through withholding of liquids.
I'm so sorry for the factual rendering of my explanations, I am firmly in academic-writing style-mode after completing two assignments this week and it will be a while before my stylised writing mojo comes out from hiding again!!
Anyway, you can take the liquid withholding route and hope for the best over a longer period of time (because he will eventually want a drink before bed and need to figure out staying dry), or take a more intense learning period of helping him gain awareness of his body and its processes. It's not the easy way, but then, having done both ways, neither is easy and one made a lot more sense, with greater longitudinal benefit. Just sayin'
Keeping it positive and achievable is the key to however you do it.
ETA: Onyx, your move