Do You Sleep With Your Eyes Slightly Open? Signs and Habits

Some people wake with one particular kind of dryness: eyes that feel scraped in the first seconds of the day, then ease as the morning goes on. Patients often tell me they assumed that is simply what mornings are. Sometimes it is, and sometimes their lids were not quite shut all night.

What a lid that stops short does to an eye

Asleep, you have no maintenance left. Blinking has stopped, tear production runs at its lowest, and the only cover the eye has is the lid lying across it. That works beautifully until the lid stops a fraction short of meeting its partner.

A gap of a millimeter or two is enough to leave a narrow strip of the eye uncovered for seven hours, with no blink arriving to lay down a fresh layer.

This has a name, nocturnal lagophthalmos, and it is common enough to be worth knowing about. It also goes unrecognized for years, because by daylight the lids look entirely normal and close perfectly well when asked.

Why the sore patch sits low on the eye

Here is the detail that makes sense of the rest. As the lids come down, the eye itself tends to roll upward behind them, so an incomplete close leaves the lower part of the eye out in the air rather than the middle or the whole of it.

That gives this dryness a shape: the grittiness and the redness sit in a low band instead of spreading evenly.

Why it is worst in the first minute of the day

Through the night the exposed strip dries with nothing interrupting it, so the worst moment of the day is the moment you open your eyes: lids that feel stuck, and a first blink that scrapes.

Then it eases. Blinking resumes, the surface is covered over and over, and within an hour or two most of it has gone. That shape is worth noticing, since dryness built up by a day at a screen peaks in the evening instead.

Nor is this about how long you sleep. Short nights do travel with drier eyes, and our piece on what a short night changes works through why, but you can sleep nine excellent hours and still wake with a dry band low on the eye. What is at stake is the seal.

Signs worth showing someone

You cannot watch your own lids while you are asleep, and there is nothing here to pass or fail at home. What you can do is collect what is worth saying at an appointment.

• Someone has noticed. A partner mentioning a sliver of white between your lids is the most direct observation there is.
• The timing fits. Worst on waking, clearly better an hour or two later, on most mornings rather than only after a hot night with a fan on.
• The irritation sits low. Redness or soreness along the bottom of the eye, in the same place each morning.
• One eye is clearly worse. Worth saying in its own right, since several of the causes behind this work on one side only.

The morning itself deserves a plan, and our morning routine article sets out a calm three minute one.

What makes a lid less likely to seal

For many people there is nothing in their history at all. Still, a short list raises the odds.

• A facial nerve weakness in the past. A Bell's palsy or shingles across the face can leave the lid's closing muscle slightly weaker long after everything else recovered, on that side only.
• Thyroid eye disease. It pushes the eye forward and draws the lids back, so there is more eye to cover and less lid to do it with. Thyroid disease is on the American Academy of Ophthalmology's list of dry eye causes.
• Earlier surgery on the lids or brow. An eye needs a certain amount of skin to close over. Swelling in the first week is ordinary; a lid that has not closed properly since is not.
• An upper lid that has gone lax. A loose, rubbery lid turns outward easily overnight and rubs against the bedding, usually on the side you sleep on. It accompanies sleep apnea often enough that an eye doctor who finds it asks about snoring.
• A CPAP mask that leaks upward. Not a lid problem at all. A seal lifting at the bridge of the nose sends pressurized air up across the eye all night, and it wants a refit from whoever set the machine up.

What to do tonight

• Ointment or a thick drop at bedtime. The Academy's advice is aimed at the symptom and not at the lid: for eyes that wake up dry and scratchy, it advises an artificial tear ointment, or thick drops, just before sleep. Where a gap leaves a strip uncovered, this layer is the only protection it gets all night. A thin drop is gone long before the night is, and ointment blurs vision for a few minutes, so lights out is where it belongs. Our eye drop guide explains how the labels differ.
• A mask that does more than block the light. Most rest on the brow and the bridge of the nose, leaving an air pocket over the eye that does nothing for a gap. What has support behind it is a chamber style mask that holds humid air against the closed lids.
• Point the moving air somewhere else. A fan aimed at the bed is the office vent in another room, with one difference worth respecting: seven hours across an eye that is not blinking.
• Give the room some moisture back. The NHS and the National Eye Institute both list a humidifier. It will not close a lid, and it does reduce what the gap costs.
• Taping the lids is a real technique, not folklore. It is also easy to get wrong, including taping over a lid that is not really closed underneath. Ask an eye care professional to show you first.

Ointment only works on the nights you remember it, and DryEyeGuide takes a reminder in your own wording on the days you pick.

Who should look at this, and when it cannot wait

A lid that does not meet is among the quickest things in eye care to confirm.

An eye care professional asks you to look down and close your eyes gently, then looks for a space between the lid margins. A drop of dye then shows whether the lower eye has been taking wear overnight. Against years of wondering, that is a good trade.

The NHS asks for a few weeks of home care first: if dry eyes are no better by then, see an optician or GP. It also says to go if the shape of your eyelids changes, which is the line that fits this subject best.

Some things do not wait. An eye that is painful and red rather than merely dry needs an urgent appointment, and so does a red eye in a contact lens wearer. Changes to your sight, pain on looking at light, or something stuck in the eye need emergency care straight away.

If any of this sounds like your mornings, the task is not to decide whether you have it. It is to say one sentence at your next appointment: I think my eyes may not close all the way when I sleep. In my experience that changes a visit, because it points at something checkable, and meanwhile the ointment goes in at lights out and the fan points at the wall.