system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What happens to your brain when you get knocked unconscious?
gpt
It's not really well understood, to be honest. 

Either through a knock to the head or with drugs, it disrupts the workings of the brain. Your brain is still functioning, but it's taking much longer to do anything so something that requires lots of "processing", like consciousness can't really happen. 

If it's a blow to the head, your brain is busy trying to fix things and get everything back into order.

If it's anaesthesia, the drugs are slowing down the connections the brain needs to "talk" to each other,so you're unconscious.