This is a problem.
With what you describe, it’s very likely that he is minimising his drinking in front of you, masking it to an extent, so that you only see the lower end of his habit. A quick guzzle here, a secret refill there. And if you go to bed before him, he has free reign whilst you’re asleep when he’s ‘watching tv’.
If you don’t have a problematic relationship with drink yourself, you won’t necessarily be able to see the signs as clearly. This is a case of ‘if you know, you know’, and it sounds like you’re at the sideline voicing your concerns because his behaviours are somewhat noticeable to you.
He’s addicted to an accepted liquid drug that is all around us. Everywhere we look, many things we (he) does, it’s there, never far away. What he’s doing is ‘topping up’, and the perfect example is when he falls asleep (because of the drink) and wakes up and necks more wine before bed. It’s just the same as someone snorting coke but because it’s in a bottle from the supermarket it’s ‘okay’.
You could try approaching him on the basis that you are concerned about his long-term health and as such, you want him to take a liver function test and general health screen. With such regular intake over a long period of time I would anticipate that the signs will be there and the test will prove your fears.
From there it very much depends on whether he accepts there is a problem and whether he, not you, will do anything to change his habits.
Educate yourself on alcoholism. It was a defining moment in my life when I realised that my own habits were a bi-product of our culture, my personality, my father’s habit, and just what the inevitable long term health issues would have become.
Good luck. And don’t be the wife of a functioning alcoholic forever.