Eye gunk is a mix of mucus, oils, dead cells, tear residue. This forms in our eyes because we do not blink our eyes while sleeping so it forms in the corner of our eyes.
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This is a normal thing that we all had Experienced but if the eye gunk is forming in excess and change in colour as green and yellow and sticky then it is the indication it may be as an allergy/infection to the eye.
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WHY THIS HAPPENS??
Eyes naturally clean up themself in the night time. At the night time the dust particles will form and end up in the corner of our eye.