The first book ever published on the subject, Dr. Donal F. Sweeney reveals what an alcohol blackout is. The alcohol has blocked memory formation, reducing the victim to an unconscious state in which he does not know who he is or what he"s doing. Yet, his pre-blackout memory remains, allowing him to walk, talk and appear to function while in an unconscious state. He is thus a menace to himself and others. Dr. Sweeney tells how to recognize the unconscious state, what to do about it and how to prevent blackouts.