Why Do We Get Eye Discharge?
You know that crusty stuff that shows up in the corners of your eyes when you wake up? That’s called eye discharge (also known as "sleepers", "eye mucus", or "gunk"), and it’s totally normal most of the time. I started noticing it more after mowing the grass at our small local park - every time we cut the grass, I wake up the next morning with extra buildup in my eyes. Sometimes even during the night, if I get up for water, it’s already there. That got me wondering: what exactly is eye discharge, and why does it seem to show up more at certain times?
What Is Eye Discharge (Eye Mucus)?
Eye discharge - the stuff we casually call "sleepers", "sleep", "eye gunk", "eye boogers", or "crusties" is medically known as rheum. It’s a combination of:
- Mucus from the conjunctiva
- Oil from the meibomian glands
- Dead skin cells
- Tears and dust or debris that collect overnight
During the day, blinking flushes this mix away with your tears. At night, since your eyes stay closed and you’re not blinking, it builds up and dries in the corners of your eyes or along the lash line.
What is Rheum?
Rheum is the medical word for the gunky stuff that comes out of your eyes (or sometimes your nose or mouth) while you sleep. It’s made up of things like:
- Mucus
- Oil
- Dust
- Dead skin cells
- Tears that have dried up
So rheum is just dried-up eye mucus and oil that collects in the corners of your eyes when you're not blinking - aka eye discharge or "sleepers", "sleep", "eye gunk", "eye boogers", or "crusties" in your eyes.
What’s Mucus from the Conjunctiva?
- The conjunctiva is the thin, clear skin-like layer that covers the white part of your eyeball and the inside of your eyelids.
- It helps protect your eye and keeps it moist.
- It naturally makes a little bit of mucus to trap dust and dirt, like a built-in filter.
It’s the clear lining over your eye and under your eyelid that makes some sticky stuff to keep your eyes clean and moist.
What’s Oil from the Meibomian Glands?
- The meibomian glands are tiny oil glands along the edge of your eyelids, near your eyelashes.
- They release a light oil that keeps your tears from drying out too fast.
- Without that oil, your eyes would feel dry or watery.
These are little oil making glands in your eyelids that keep your eyes from drying out by adding oil to your tears.
So when you’re sleeping and not blinking, that mucus, oil, and some dead skin cells all collect together in the corners of your eyes - and that’s what we call "sleep", "sleepers", "eye crust", etc.
Why Does Eye Discharge Happen?
Rheum is part of your eye’s natural cleaning process. But there are things that can make it more noticeable or excessive:
- Dry eyes: Your body may overproduce mucus to compensate.
- Allergies: Can cause watery, itchy eyes and more discharge.
- Irritants: Like smoke, dust, makeup, or old mascara.
- Infections: Like conjunctivitis (pink eye), which usually causes yellow or green discharge and crusty lashes.
- Blocked tear ducts or blepharitis (inflammation of the eyelid).
If it’s clear to white and crusty, it’s probably normal. If it’s green, yellow, thick, or sticky - especially with redness or pain - it could be a sign of infection.
When Eye Discharge Could be Something More
Most of the time, eye discharge is nothing to worry about. But sometimes, it can be a clue that something else is going on - like pink eye (conjunctivitis), an eye infection, or allergies.
- Pink eye usually causes thick, yellow or greenish discharge, along with redness, itching, or a burning feeling. You might even wake up with your lashes stuck together. Pink eye is contagious, especially if it’s viral or bacterial.
- Allergies can lead to watery, itchy eyes and more clear or stringy discharge.
- Blocked tear ducts or blepharitis (inflammation of the eyelids) can also increase discharge and make your eyes feel irritated or gritty.
If the discharge becomes constant, changes color, or comes with swelling, pain, or blurry vision, it's a good idea to have it checked out by a doctor.
Home Remedies for Eye Discharge
If you’re just dealing with regular morning crusties, here are a few gentle home care options:
Warm Compress
- Soak a clean washcloth in warm (not hot) water.
- Place it over closed eyes for a few minutes to soften and loosen any buildup.
- Gently wipe from the inside corner out.
Saline Rinse
- Over-the-counter sterile saline eye drops can help flush out debris.
- Use as directed, especially if you’ve been exposed to dust or allergens.
Good Eyelid Hygiene
- Wash your face before bed to remove makeup and allergens.
- If needed, use a gentle baby shampoo diluted with water and a cotton swab to clean the lash line.
Use a Humidifier at Night
- Helps keep eyes from drying out, especially in dry indoor air or during winter months.
When to See a Doctor for Eye Discharge
It's good to see an eye doctor if you notice:
- Yellow/green discharge
- Pain or light sensitivity
- Blurred vision
- Swelling or redness that doesn’t go away
Eye discharge (eye mucus) might not be the prettiest part of waking up, but it’s usually just a sign that your eyes are doing their job - cleaning out the dust, oil, and tiny particles that build up while you sleep. Most of the time, it’s totally normal and nothing to worry about. Just keep an eye on any changes - like color, thickness, or discomfort - that could mean something more is going on. With a little daily care, warm water, and some good hygiene, managing eye discharge is simple and safe.
