I had NyQuil® in mind when I made my original statement. All I'm saying is that alcohol has a current medical use as a sleep aid. It is in NyQuil® and not DayQuil® for that reason.
It is not used by itself as a sleep aid, although I remember stories about my grandmother giving a tablespoon of liquor to her children to get them to go to sleep.
Besides, my whole point was that alcohol is currently used in medicine, so I'll just rest my case there.