system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What exactly happens to our bodies during sleep that allow us to recover from injury and illness so effectively?
gpt
Think of your body as a space ship.

When you are awake, the ship is on alert. You need to divert energy and people to activate all your sensors (all your senses) and have your engines and weapons ready to deal with anything that life throws at you. If ship sustains any injuries like a hull breach, only the immediate treatment is done (seal the injury by clotting).

When you are asleep, the ship changes to a much lower alert state. The sensors and weapons can be powered down. Energy and people are diverted to work on maintenance and repair.