driving beer and sleeping most of day

Husband is starting as early as 10:00 AM, and drinking and sleeping until he goes to bed at 4 to 6 in the evening. He has dementia, and sits and stares into space all day. He refuses to go out of house, only bathes when a certain caregiver comes. He has no energy, or desire to watch TV, or read, or even take a short walk. He did drink, before, but never like this. He seems to forget how much he has drunk, 8 to 10 cans of light beer, and often wine as well. He is drunk and just falls into bed. He is just quiet, and sleepy. I have tried all the tricks to stop or lessen the amount of alcohol, all to no avail.