Sleeping with half-open eyes is not due to eyes that are too big, but to incomplete eyelid closure. The causes include nerve palsy, blepharospasm, eyeball protrusion, and functional eyelid closure insufficiency.
1. Nerve palsy: After facial nerve palsy, orbital orbicularis muscle paralysis causes lower eyelid relaxation, resulting in incomplete eyelid closure. The phenomenon of eye exposure occurs during sleep.
2. Ectropion: Eyelid skin defects caused by trauma, inflammation, etc. result in ectropion of the eyelid, which cannot be closed.
3. Protruding eyeballs: diseases such as thyroid disease and glaucoma cause the eyeballs to protrude, making the eyelids unable to close.
4. Functional eyelid closure insufficiency: mostly seen in orbicularis oculi muscle weakness, eyelids partially closed during sleep, still leaving a gap, such eyelid closure insufficiency generally does not affect sleep, no treatment.
If the incomplete eyelid closure causes dry eyes, tearing, conjunctival congestion and other discomforts, it is recommended to go to a hospital specialist for examination and treatment.