What you see on your eyelids isn’t tiredness. It’s not a passing allergy. It’s eyelid contact dermatitis. And it’s happening while you sleep. The skin on your eyelid is five times thinner than the rest of your face. It has no defenses. When something it hates touches it—a chemical, a dust mite, perfume, whatever’s on your pillow—it doesn’t swell up by chance. It swells up because it’s dying. The redness isn’t redness: it’s blood trapped in broken tissue. The dryness isn’t dryness: it’s the barrier bursting. That crust that starts to form is serum leaking because your skin can no longer seal. And if you keep sleeping with it night after night, your eyelashes fall out, your eyelid becomes leathery, the color turns purple or black. Then comes the infection. Pus. Swelling that closes your eye. And the doctor says two words that chill you to the bone: orbital cellulitis. The infection is no longer on the skin. It’s behind your eye. It’s eating away at the fatty tissue that protects it. If you get there, there are two outcomes: surgery to drain the pus, or losing your eye. So take a good look in the mirror before you turn off the light. Something is sleeping with you. Something touching your face while you can’t see anything. But your eyelids can. And they’re screaming at you.