Effects of Drinking
Among the effects of drinking is its impact on the memory. Many alcoholics drink to chase a certain high that comes from increased dopamine release. It is difficult to maintain this level of dopamine release without blacking out.
When drinkers blackout, their brain can no longer imprint memories in the temporal lobe. That is why after a night of heavy drinking, many have difficulties recalling what occurred the night before; the memories quite simply are not there. Most can only remember bits and pieces because the brain went in and out of this blackout state.
You can learn more about the effects of alcohol on the brain and other effects of Drinking, by reading Brain in Balance: Understanding the Genetics and Neurochemistry behind Addiction and Sobriety. You might also like his video, Fragmented Memory: Benzos, Narcotics & Alcohol Toxicity, featured on YouTube.