Many causes: Some people naturally sleep with their eyelids open 1-2 millimeters. Sometimes there is an underlying condition that contributes to poor eyelid closure such as graves' disease or bell's palsy. Sleeping with the eyelids open can lead to dryness of the corneas (exposure keratopathy). An eye exam is important to assess the health of the cornea and determine the proper treatment.
Answered 7/17/2013
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