Question

Why we close our eyes while sleeping ​

Answer 1

While the phenomenon isn't entirely understood, the most common cause is asleep disorder called nocturnal lagophthalmos, which basically means an inability to fully close your eyelids at night. ... Luckily, most people who sleep with their eyes open don't suffer any serious side effects.

Answer 2

One reason that it happens is problems with the facial nerves or muscles that make it difficult to keep the eyes fully closed. It can also occur because of problems with the skin around the eyelids. If people keep their eyes open while sleeping, their eyes can dry out