system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: how does sleep quality effect mental clarity?
gpt
As you think and operate your brain, electrical signals are passed between the axons and dendrites in your nerves to reinforce pathways.  This process involves chemical reactions, and over the day plaques (the resulting salts) build up on the receptors similar to how they do on a battery as it is used.

At night during one of the phases of sleep, most of your brain “turns off” and then gets flooded with cleaning fluid that washes away these plaques for disposal.  After getting rinsed, those areas of the brain come back online and can now send and receive and reinforce signals without interference.