Many people wake up in the morning and notice yellow crust, sticky discharge, or dried mucus in the corners of their eyes. In most cases, this is completely normal and happens because your eyes continue cleaning and protecting themselves while you sleep. Throughout the night, tears, oils, dead skin cells, dust, and mucus collect together and dry near the eyelids, creating what many people call “sleep” in the eyes.
Normally, a small amount of light yellow or whitish crust is harmless and easy to wipe away. But when the discharge becomes thick, darker yellow, excessive, or causes the eyes to feel stuck shut in the morning, it may be a sign that something else is going on.
One common cause is conjunctivitis, also known as pink eye, which can happen because of bacteria, viruses, or allergies. This condition often causes redness, itching, watery eyes, and sticky discharge that keeps coming back throughout the day. Another possible reason is dry eyes. When the eyes don’t produce enough healthy tears, irritation can develop, leading to mucus buildup overnight.
Eyelid inflammation, called blepharitis, is another common issue. This happens when the edges of the eyelids become irritated or clogged with oil and bacteria. People with blepharitis may notice crusty eyelashes, itching, burning sensations, or swollen eyelids when they wake up.
Allergies can also play a role, especially during pollen season or after exposure to dust, pet hair, or smoke. In these cases, the eyes may feel itchy, watery, and irritated along with mild yellow discharge.
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