system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do our eyes burn when we are tired or sleep deprived?
gpt
In addition to muscle strain from keeping them open for long periods of time, eyes can also burn when you are tired or sleep deprived from lack of lubrication. Dry tired eyes can be quite burny. It is your eyeballs saying to you "please give me a break!"