Vintage sleeping aid

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Scientists of 4chan I need your help. I'm a writer and am looking for scientifical accuracy in my fantasy setting.
Thing is I need a chemical compound (which when ingested causes loss of conciousness) from 1920s in the latest, which can be dissolved in alcohol and works instantly, but briefly. I was thinking of using Tiopental but maybe you know something more common and (oldschool)-major factor