[powatom]

I fear it's far more likely that you have other issues and the alcohol simply helps you focus. Lots of people are able to 'forget about themselves' during work and simply focus on the job. This becomes a lot more difficult when you don't actually need to be doing anything, and your mind is freed up to do what it does best: wander.

Alcohol may simply be allowing you to forget about some other distraction in your mind. Don't fall into the trap of thinking that it's the alcohol making you a better programmer: if you can't get through the night without a drink - then you could have a problem. Next time you reach for a drink, stop yourself - and ask yourself what your motivation is. 'Focus' implies that you are currently unable to focus, which implies distraction. Find the distraction.