Why You Wake Up with Gunk in Your Eyes

That yellow stuff in the corners of your eyes when you wake up—often called “sleep” or eye discharge—is perfectly normal. It’s a mix of mucus, oils, dead skin cells, and even some bacteria. While you’re asleep and not blinking, these materials naturally collect in the corners of your eyes. It’s just part of your body’s way of maintaining healthy, moist eyes overnight.

The yellow color mostly comes from dead bacteria that your immune system has fought off during the night. Your eyes are constantly exposed to irritants, so this discharge is a sign that your body is defending itself. It’s like a quiet overnight clean-up crew working while you rest. Pretty amazing, right?

But not all eye discharge is harmless. If you notice a big increase in the amount, or if it’s paired with redness, itching, pain, or blurry vision, it could be a sign of infection. Conditions like conjunctivitis (pink eye) can cause symptoms like these, and it’s important to see a doctor if they appear.

So the next time you wake up with a little crust in your eyes, don’t be alarmed—it’s usually just your body doing its job. That tiny bit of gunk is actually a small reminder that your immune system is always on duty, even when you’re fast asleep.

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