Ohhh man....I wish I had some sort of help to offer, but I don't know the first thing about gliders. But I'll say a prayer for the little fuzzies! I hope you're able to get to the vet in time to discover whatever it is and treat it! I know you really care about your critters.

Is it remotely possible that there is some sort of contaminant in the room? Or maybe an airborn virus or bacteria. Whatever it is, I hope the little guys are strong enough to get through it!!