Possible to come back from madness lvl 8?

On my experimental alt I had him camped outside my mains base. He never slept in a bed, he was KO'd on another persons claim at one time, and I generally just treated him bad.
Now I noticed that his madness lvl is up to 8. Is it possible to bring him back from this?

Now I noticed that his madness lvl is up to 8. Is it possible to bring him back from this?