Hello OP. Well done for posting - probably the first step, as subconsciously you've realised maybe it's not the best thing to be doing.
Secondly, to everyone who has posted 'I drink loads and I'm the healthiest person I know' - yep you might be on the outside, right now. But it DOES catch up with you. My auntie was the same as you OP, it gradually increased to a bottle and a half a night. Outwardly she was fine, fit as a fiddle. Then her liver failed. And everything started going wrong. She was only early 50s. Very ill now.
I'm not saying this is you at ALL, but she used to drink when my cousins were asleep, thinking it didn't affect them. She missed the signs of a serious illness in one of my cousins because although she didn't get 'drunk' obviously she was in a nice little wine bubble and just wasn't paying as much attention. She also injured herself a couple of times as her intake increased and she was - again not drunk - but just slightly unsteady.
The reason I post this is not to be horrible or spiteful or make you feel bad, but just to point out that this 'I drink loads and I'm in my 50s and fine' attitude of some posters shouldn't be taken as something to clutch onto to reassure you it might be ok to carry on. Sure they might stay healthy, but they also really might not.
My Dad is also a drinker. He could cut down at any time apparently and would miss a day here or there, and I believe there was a time a few years back when he COULD stop, but he can't now. And that's what you don't want to spiral into, even if you believe it's not a problem at the moment. He wasn't overweight, he wasn't unhealthy, he never got drunk - but he is unhealthy and overweight now because it's caught up with him. He seems to plan his life around where he can go to pubs, I'm not saying this is you right now, but that's the way it can spiral. Like anything, being unknowingly reliant on food, exercise even...
Trying to cut down a bit initially would probably be a good step, to see how you get on, as with any habit it's very difficult to just stop. Some previous posters have shared some excellent books and resources, I hope you take them up on the suggestions :)
Good luck!