There are two forms of alcohol blackout. In one (en bloc) blackout, the person experiences amnesia covering the entire period of intoxication whereas in fragmentary blackout the person experiences partial amnesia of that period. The latter are more common than the former
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It is important that blackouts not be confused with being passed out or being unconscious. When people are passed out, they are not conscious of what is going on during that period of time. On the other hand, people who suffer a blackout are experiencing amnesia; they were conscious and aware of what was going on while intoxicated but now they can't remember what happened.
Blackouts are caused by interference with the ability to transfer memories from short-term into long-term memory. Memory should return to normal after sobering up, but the "lost" memories may or may not surface later.
You should know that alcoholic blackouts are one of the primary signs of developing Alcoholism.
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I can't remember.
Seriously, if you got drunk and can't remember what happened, you have a drinking problem. Long term, there is some EVIDENCE to SUGGEST that it MAY be a CONTRIBUTING FACTOR to memory impairments. No doubt, Alcohol Control will spin this as "alcohol causes long term memory loss" (and it also shrinks your gentials!).
Moderate drinking can actually reduce the chances of Alzheimer's disease, such as a glass of red wine a day. But too much is not good for anything.