These guys are obviously a LOT smaller than Kibbits when he was sick (he was a 1-year old WTF), but, one thing we did (and something I think kept him alive for as long as he did without eating), was make a VERY mild pedialyte dilution in his soaking pond. The pond was about a 1/4 cup of treated frog water. To that, as instructed by the vet, we put in 0.1 ml of clear pedialyte. (You can find it in the baby aisle at the grocery store). The pedialyte provides electrolytes, and can help to encourage eating, and help with potential dehydration. Given their size and fragility, I would guess that you need to dilute it much more than that, but that's the only advice I can think of to help them get through the night.

Hope that helps!