ESLD, you might ask your doc's medical staff about giving him melatonin. My doctor recently recommended it to me for sleep. It is a naturally occurring hormone that regulates sleep, but older people and those with certain illnesses have insufficient amounts. I have been sleeping much better since I took it. It's not a drug and there is no hangover or chance of overdose.
BTW, y'all, it's spelled Ativan (and is on my Medical Word List on the first page.)