system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:When I'm tired, why do I feel a burning sensation in my eyes?
gpt
As you get more tired, your body tries to shut down so you'll go to sleep. That affects the amount of tears that are released by your tear (lacrimal) gland. So, less tears flowing, eyes dry out, and it burns. What's your body's solution to that? Close your eyes to cover the dry surface. Which, when you close your eyes, your body will also want to sleep. The burning is telling you to close your eyes and go to sleep.