If he has not had any ETOH in at ;east a few days and is not already vomitng and shaking, I sure as hell wouldn't advise starting THAT all over again. We don't know the circumstances and we don't know if the hospital just "turfed" him to you to open up a bed. If he has not genuine;y been medically detoxed, he should not have been released but in the USA, they drop withdrawing addicts in their hospital gowns at bus stations and occasionally at an all night eatery near my home. Soooo.... that said, we know very little.

If he is on the couch, have him rest elevated so he cannot aspirate on his own vomit and make sure somebody is with him until morning as in sitting in a chair nearby. Unless you are a medical professional, you should not have been left with this. This is 1970s style stuff. If he begins have symptoms that alarm you or if he becomes combative and wants to leave - please, put him back into the systems hands by calling for an ambulance and always state you are unqualified to deal with this and you are worried for his life. That often works.

With a little time, he'll be in a facility better equipt to handle this. Take care and again, bless you for caring so much.