system
Given the following post, respond as if you're commenting on Reddit:
human
Eli5 why do we lose all memories when we get blackout drunk?

As stated above I'd like to understand how one does not have any recollection what has happened from one moment in a night of alcohol consumption. How does alcohol triggers this and why ?
gpt
Our brain builds memories, think of memory like a house.The material to build the house, is the information that you see, taste, touch, hear, smell. These materials are transported by nerves, which are the roads, to the building site in your brain (known as the hippocampus) so you can start building your houses. 

When you drink around 3x the driving limit, alcohol acts like a roadblock, stopping the delivery of your materials. If they can't reach the building site, in the end, you can't build your houses. 

It's this blockage that causes the gaps in your memory, aka blackouts.