There's no compelling reason why this wouldn't work. AIOs, by their very nature, don't tend to be quite as leakproof as a seperate diaper & cover (the inside absorbant material can sometimes 'roll' out and wick moisture to clothing, that kind of thing). But that's a theoretical kind of thing, certainly not an absolute. And if they're working well during the day then it's certainly worth a shot at night.

Karen.