Did your sleep improve after quitting?

I've heard that drinking alcohol is very bad for sleep. But how long after drinking is sleep affected? I have nightly insomnia, therapy and medication haven't worked.

I used to binge drink (4+ standard drinks, usually 2-3 pints of beer) on Friday nights. I'm currently 2 months completely sober, still haven't seen any improvement in sleep.

How likely is this habit to be causing my insomnia during the rest of the week? How many more months until you start seeing an improvement in insomnia if alcohol was the culprit?

My problems are that it takes several hours to fall asleep, and once I do I wake up in the middle of the night and the early morning and can't fall back asleep.

I quit both caffeine and nicotine last year, so the only substance left that could be messing up my sleep is alcohol.