system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why on earth do leg cramps hurt so much, and why do they happen in the middle of the night sometimes?
gpt
Sodium deficiency is the most common cause, especially if you do endurance athletics. They hurt bc it is the full force of your muscle contracting without anything holding it back. Basically the nerve's wiring is cut off because sodium is the "wire."