Sad to say he didn't make it through the night. He was pretty rigid, so I'm guessing he died soon after I last checked on him late last night. Maybe he was waiting for peace and quiet?
Thanks for everyone's well-wishes and advice, this has definitely been a learning experience for me.
His laundry basket was lined with a fresh towel every other day, so he was comfy. And I need to get some new towels.