Sleeping With Eyes Open: Nocturnal Lagophthalmos
Sleeping with one or both eyes partly open can happen when the eyelids do not fully close during sleep, a condition called nocturnal lagophthalmos. The exposed eye surface may dry overnight, so clues can include morning dryness, redness, burning, a gritty feeling, tearing, sensitivity to light, or temporary blurred vision. Those symptoms can have other causes too, so they do not confirm the condition on their own.
If your eyelids stay partly open while you sleep, part of the cornea can remain exposed instead of being protected by a closed, tear-covered eyelid. That may explain eye irritation that is strongest when you first wake. Persistent pain, vision changes, new facial weakness, eye bulging, or symptoms that begin after eyelid or facial surgery deserve professional eye evaluation rather than home treatment alone.
What Is Nocturnal Lagophthalmos?
Lagophthalmos means the eyelids cannot close completely. When this happens mainly during sleep, it is called nocturnal lagophthalmos.
Closing your eyelids normally protects the front surface of the eye and helps maintain the tear film. If a small area remains exposed for hours overnight, moisture can evaporate and the cornea or conjunctiva may become irritated.
The opening can affect one eyelid or both, and it may be subtle enough that only a partner or clinician notices it.
The main eye-health concern is prolonged surface exposure and drying, not the fact that someone can technically see part of the eye while the person sleeps.
Dryness, Burning, Grittiness, Tearing and Blurred Vision
Nocturnal exposure can irritate the ocular surface. People may notice symptoms mainly after waking because the eye has been exposed for a long period without normal daytime blinking.
The eye may feel sandy, rough or as if something is stuck under the eyelid.
An exposed corneal surface can feel sore, stinging or uncomfortable after sleep.
Morning redness may occur when the eye surface has been irritated overnight.
Dryness can sometimes trigger reflex tearing, so a person may wake with watery rather than obviously dry eyes.
Tear-film disruption can temporarily blur vision. Persistent or worsening vision change needs an eye examination.
Photophobia can occur with corneal irritation and should be taken more seriously when paired with pain or vision change.
What Can Cause Sleeping With the Eyes Open?
| Possible contributor | How it may affect eyelid closure | Context worth reporting |
|---|---|---|
| Facial nerve weakness | The facial nerve helps control eyelid closure. Weakness or paralysis may prevent a complete blink or full closure. | New facial drooping, trouble closing one eye while awake, or a history of Bell’s palsy or facial-nerve injury. |
| Thyroid eye disease | Eye protrusion and eyelid retraction can make it harder for the lids to cover the cornea completely. | Bulging eyes, eyelid retraction, swelling, double vision, pain with eye movement or thyroid-disease history. |
| Eyelid or facial surgery | Procedures around the eyelids or face can sometimes alter lid position, length, muscle function or closure. | Symptoms beginning after blepharoplasty, eyelid tightening, orbital procedures or facial surgery. |
| Scarring or trauma | Scarring can physically restrict eyelid movement or change its position. | Previous burns, injury, facial trauma or significant eyelid inflammation. |
| Prominent or protruding eyes | The eyelids have a larger surface to cover, making complete closure more difficult in some people. | Changes in eye prominence or one eye appearing more forward than before. |
| Eyelid anatomy or muscle function | Some people have lid anatomy or muscle tone that leaves a small opening during sleep even without an obvious disease. | Long-standing pattern with no recent change, especially if noticed by a partner. |
Sleeping With Eyes Open Is Not the Same as Sleepwalking
People who sleepwalk may move around with their eyes open even though they are not fully awake. That does not mean their eyelids remain partly open for the entire sleep period.
The eyelids fail to close fully during ordinary sleep, which can expose the eye surface for a prolonged period.
A person partially arouses from sleep and may sit up, walk or perform behaviors with eyes open. The eyes usually close again when the episode ends.
Eyes Open During Sleep: Which Pattern Fits Best?
That pattern fits nocturnal lagophthalmos more closely and is worth discussing with an eye-care professional.
Dry-eye disease, blepharitis, allergy, contact-lens irritation and other causes can look similar. Morning symptoms alone do not prove lagophthalmos.
This is a parasomnia pattern, not persistent eyelid-closure failure. The eye usually closes again when the episode ends.
Facial-nerve dysfunction can impair eyelid closure. Sudden weakness, especially with other neurologic symptoms, needs urgent medical assessment.
Thyroid eye disease is one possible cause and warrants professional evaluation rather than self-treatment.
Contact the treating clinician because postsurgical lid position or closure may need to be checked.
How Nocturnal Lagophthalmos Is Evaluated
A clinician can often learn a lot from the history and a focused eye examination. They may look at how completely the eyelids close, eyelid position, blink strength, facial movement, eye prominence and the condition of the cornea and tear film.
A slit-lamp examination can show exposure-related surface changes that are not obvious in a mirror. The clinician may also consider thyroid eye disease, facial-nerve dysfunction, prior surgery, trauma, scars or another eyelid problem.
Record dryness, burning, redness, tearing, gritty feeling, blurred vision or light sensitivity and whether one eye is worse.
Ask whether a small gap remains between the eyelids during ordinary sleep and whether it affects one eye or both.
Note whether you also struggle to blink or fully close the eye when awake. Do not repeatedly force or manipulate the eyelid to test it.
Write down new facial weakness, thyroid symptoms, trauma, cosmetic procedures, eyelid surgery or other recent facial procedures.
Persistent blur, double vision, reduced vision or light sensitivity deserves specific mention rather than being grouped under “dry eyes.”
What Sleeping With Your Eyes Open Does Not Automatically Mean
Nocturnal lagophthalmos is primarily an eyelid and eye-surface problem. It is not the same thing as insomnia, sleep apnea or sleepwalking.
Thyroid eye disease can interfere with eyelid closure, but there are many other possible causes.
Dryness, redness and irritation can come from several eye conditions. Examination is needed when symptoms persist.
Consumer wearables do not measure whether your eyelids completely cover the cornea or whether exposure has injured the eye surface.
Sleeping With Eyes Open FAQs
Can you really sleep with your eyes open?
Yes. In nocturnal lagophthalmos, one or both eyelids remain partly open during sleep. The opening may be small enough that the person does not know about it until a partner notices or morning eye symptoms lead to an examination.
Why are my eyes dry when I wake up?
Incomplete eyelid closure is one possible cause because exposure increases evaporation from the ocular surface. Dry eye disease, eyelid inflammation, contact lenses, medications and environmental factors can cause similar symptoms, so persistent dryness should not be self-diagnosed as lagophthalmos.
Can sleeping with your eyes open damage your eyes?
Prolonged exposure can irritate or damage the corneal surface. Exposure keratopathy can cause pain, redness, light sensitivity, blurry vision and, in more severe cases, corneal injury. Persistent symptoms deserve an eye examination.
Is sleeping with eyes open the same as sleepwalking?
No. Sleepwalkers may have their eyes open during an episode while the brain remains partly asleep. Nocturnal lagophthalmos means the eyelids themselves do not fully close during ordinary sleep, which can expose the eye surface for much longer.
Can Bell’s palsy cause sleeping with one eye open?
Yes. Facial-nerve weakness can make it difficult to fully close the eyelid. New facial weakness or sudden inability to close one eye should be medically evaluated, especially if other neurological symptoms are present.
Can thyroid problems cause nocturnal lagophthalmos?
Thyroid eye disease can cause eye protrusion and eyelid retraction, which can make full eyelid closure difficult. Eye bulging, lid retraction, swelling, double vision or vision change should be assessed by an appropriate eye specialist.
Should I tape my eyes shut at night?
Do not start a DIY taping method from online instructions. Eyelid closure methods are sometimes used clinically, but the technique and whether it is appropriate depend on the eye surface, eyelid anatomy and underlying cause. Ask an eye professional for guidance.
Sources
- Latkany RL, Lock B, Speaker M. Nocturnal Lagophthalmos: An Overview and Classification . Peer-reviewed review of eyelid closure failure during sleep, exposure-related symptoms, causes, examination and treatment concepts.
- American Academy of Ophthalmology — EyeWiki. Up to date May 10, 2026. Exposure Keratopathy . Corneal exposure, lagophthalmos, facial-nerve dysfunction, thyroid eye disease and ocular-surface complications.
- American Academy of Ophthalmology — EyeWiki. Thyroid Eye Disease . Eyelid retraction, proptosis, incomplete closure, dry-eye symptoms, corneal exposure and vision warning signs.
- American Thyroid Association. Thyroid Eye Disease . Eyelid retraction, exposure, tearing, irritation and specialist treatment context.
- Cleveland Clinic. Published February 6, 2024; reviewed for this guide September 2026. Why Do Some People Sleep With Their Eyes Open? . Current patient guidance on symptoms, facial-nerve causes, surgery-related causes and clinician-directed eye protection.
- American Academy of Ophthalmology — EyeWiki. Lower Eyelid Retraction . Eyelid malposition, thyroid eye disease, facial nerve palsy, postsurgical causes and potential corneal complications.
- Cleveland Clinic. Sleepwalking . Distinction between parasomnia episodes with open eyes and persistent incomplete eyelid closure during sleep.
Start With the Morning Eye Pattern
For several mornings, note whether dryness, burning, redness, tearing, grittiness, light sensitivity or blurred vision is present when you wake and whether one eye is consistently worse. If someone has seen your eyelids remain partly open during ordinary sleep, bring that observation to an eye-care professional. Persistent pain or vision change should be evaluated rather than managed as a simple sleep habit.
