It is normal to have a small amount of boogers, which is not disease. When you are sleeping, your eyes keep closing for a long time while the oil is still running. So the accumulated grease, the dust in your eyes and tears of impurities mix together, then the mixed things go to the corner of the eye, that are boogers. But if the boogers suddenly have been increased, which sometimes make the upper and lower eyelids and eyelashes stick together, which means you have the eye diseases---bacterial infection, so you should go to the hospital for treatment. We can say booger is a signal of eye inflammation, the timely examination and treatment is so necessary.