Evaporative nighttime stress and poor lid closure can increase dry eye disease symptoms in patients upon awakening, but a method to qualitatively evaluate the completeness of lid closure during sleep and simple ways to treat the problem can decrease symptoms.
Tear production decreases at night during sleep when the eyes are closed. Tear production rates protect the cornea and the eyelids provide mechanical protection, but during sleep the lacrimal gland produces only about a third of the daytime output of tears, Laura M. Periman, MD, told Ocular Surgery News.
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