And as I already stated, please note what the directions on any medicne that's primary purpose is a sleeping aid says about alcohol. Hint, they doen't say "add alcohol for increased results" or "substitute alcohol for similar results".
How do you explain the presence of 10% alcohol in the NyQuil®? Do you think it's for coloration, shelf life, marketing gimmick, or sleep aid?
Or, give me your own theory.