If I take mine out and there are enough lights on, or it's daylight, my gliders will tend to just sit there until they decide where they want to go. When my girls were babies, I once looked at them and left the room. I came back an hour later and they hadn't moved at all. Mine just don't like to move in the light. Usually when I turn the lights off, they start moving all over the place. That's just how my gliders are (even my new male acts the same way). So your glider might be the same, but I would still definitely take him to the vet, especially with a wet bum.