any amount of alcohol is devastating for your sleep no matter who you are
quote from an NPR podcast with neuroscientist Matthew Walker at UC Berkeley
Alcohol ... is a sedative drug, and what you're doing there is simply knocking yourself out. You are removing consciousness quickly from the brain by way of having alcohol, but you're not putting yourself into naturalistic sleep. The other issue is that alcohol will fragment your sleep — it will litter it and punctuate it with many more awakenings throughout the night, so short ... that you tend not to remember them. So, once again, you're not quite aware of how bad your sleep was when you had alcohol in the system. The final aspect of alcohol is that it is very good at blocking your REM sleep, or your dream sleep, which is critical for aspects of mental health within the brain and emotional restitution too. So alcohol [is a] very misunderstood drug when it comes to sleep — not helpful.