If the baby is being nonresponsive waiting til morning is not going to help. You need to make sure it is warm & force liquids. Is mom allowing it to suckle? If not, wrap the baby in fleece, warm it up & feed pedialyte or water if you don't have access to the pedialyte. Use an eyedropper or baby syringe. Baby won't eat/drink if he is too cold.
Google rejected joey feeding.. Joeys are fragile & once they start going downhill it can be over quick. Rush baby to a vet ASAP in the morning if it makes it through the night. Good luck, I hope your baby pulls through :(