Sleeping with your eyes open sounds like something from a horror film, but it’s a real condition called nocturnal lagophthalmos. It occurs when the eyelids can’t close enough to cover the eye—either partially or fully. Surprisingly, the condition is quite common. As much as 20 percent of people experience it, and it even occurs in babies. It can be hereditary, so if you sleep with your eyes open, your infant might, too (but most children grow out of it). However, if you still experience nocturnal lagophthalmos as an adult, it’s important to check in with a doctor. First, sleeping with your eyes open robs your peepers of important moisture. When your eyes are closed throughout the night, tears help clean and repair your cornea. That’s why the condition can lead to dry eyes, blurred vision, infection, and even permanent vision problems, if not treated. But eye irritation isn’t the only problem your physician will check for. Sleeping with your eyes o...