I'm a heavy drinker and what I've read about alcohol and sleep says that it's bad for your sleep, in particular the quality of REM sleep. Anecdotally I can back that up with my own experience, as I drink before I go to sleep.

However, it's much easier to fall asleep after you've been drinking, but that's just because alcohol is a nerve depressant anyway.

https://en.wikipedia.org/wiki/Alcohol_use_and_sleep