I have a toddler. Sometimes I can hear her get off the bed and start fucking around with things she shouldn't. That makes me open my eyes real fast.
TWICE NOW I've had sleep in my eyes when I did that. It scraped on my cornea causing lots of constant pain.
To the point where I had to go to emergency, they informed me I had an ulcer in my cornea, and made me wear an eyepatch for about a week.