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If we mean “can I get away with it,” sometimes people do.
If you mean “is it a safe habit,” no. Sleeping in contact lenses is tied to a much higher risk of serious eye infection. The Center for Disease Control (CDC) puts the risk increase at six- to eightfold. Even naps count.
What's the Problem With Sleeping in Contacts?
When your eyelids are closed, your cornea gets less oxygen from the air. Add a contact lens and you cut that down more. That “low oxygen + warm + moist + dark” setup is friendly to microbes and rough on the corneal surface.
Then there’s the “self-cleaning” issue. With lenses on, tear flow and debris clearance under the lens are reduced, especially with soft lenses, which can let irritants and by-products build up against the cornea.
Are Naps Safer Than Sleeping Overnight?
Less time helps, but the behavior still sits in the “high-risk” bucket.
CDC guidance groups sleeping or napping together when discussing this risk.
Are Any Contacts Designed for Sleeping?
Some are FDA-cleared for extended wear (overnight or continuous wear). The FDA describes extended wear lenses as approved for one to six nights or up to 30 days continuous wear, depending on the lens and your eye care provider’s evaluation (U.S. Food and Drug Administration). We cover this more below.
But two things can be true at once:
- Some lenses are cleared for overnight wear.
- Sleeping in lenses, including “extended wear,” still raises infection risk.
The Risk Ladder
Use this to “place” your situation quickly.
| Scenario | Risk level | Why |
|---|---|---|
| You remove lenses before sleep every time | Lowest | You avoid the big trigger of overnight wear. |
| You fell asleep once for a short nap | Moderate | Short exposure, but still a known risk behavior. |
| You sleep in lenses a few nights a month | High | Even occasional overnight use is linked with higher risk. |
| You sleep in lenses weekly | Very high | Repeated exposure increases chances of damage and infection. |
| You sleep in lenses and also shower or swim with them | Extremely high | Water exposure adds another infection pathway. |
| Overnight orthokeratology (Ortho-K) | Higher than most expect | The AAO flags increased infection risk such as microbial keratitis, a significant worry in children. |
The Sleep Plus Water Combo
Sleeping in contacts is risky on its own.
Mix in showering, hot tubs, pools, lakes, or rinsing anything with tap water and you add exposure to waterborne organisms. CDC advice is blunt: remove lenses before showering or swimming and keep water away from them.
Moorfields Eye Hospital guidance lands in the same place: don’t shower, don’t swim, don’t sleep in lenses unless your clinician told you to.
The Science of Why Sleeping in Contacts Can Harm Your Eyes
This is the “why,” in plain language, backed by research.
1) Your cornea runs on oxygen from the air
The cornea has no blood vessels. Overnight, with lids closed, oxygen availability drops. A contact lens can reduce it further, which is tied to corneal swelling and stress responses.
2) Low oxygen shifts corneal metabolism
With less oxygen, the cornea leans more on anaerobic metabolism, producing more lactic acid. That can draw in water and contribute to swelling.
3) Soft lenses reduce tear “refresh” under the lens
Tear exchange under soft lenses is much lower than under rigid lenses. Lower exchange means less flushing of debris and metabolic by-products, which can push irritation and complications.
4) A lens can change how your surface defenses respond to germs
Lab work suggests contact lens exposure can blunt epithelial immune responses such as beta-defensin signaling in response to Pseudomonas aeruginosa, a bacterium known for aggressive corneal infections.
5) Contact lens wear can shift the eye’s microbiome
Research in mBio found contact lens wear was associated with an ocular surface microbiome that looked more “skin-like,” with enrichment of bacteria such as Pseudomonas and Acinetobacter in lens wearers compared with non-wearers.
That does not mean lenses “cause infection” by themselves. It shows the environment changes.
6) “High oxygen” lens materials don’t erase the infection risk
Silicone hydrogel lenses improved oxygen transmission, but epidemiology work still finds overnight wear is a major driver of microbial keratitis risk, and the risk of infection with long stretches of silicone hydrogel extended wear can be comparable to shorter stretches of older hydrogel extended wear.
Shop Quality Affordable Contacts at Lens.com
What If You Accidentally Fell Asleep in Contacts?
Don’t panic, but don’t “power through” either.
| Timeframe | What to do | What not to do |
|---|---|---|
| First minute | Wash and dry hands. Remove lenses gently. (ACUVUE) | Don't rub your eyes with lenses still in |
| If lenses feel dry or stuck | Use lubricating drops and wait a bit, then try again gently. | Don't force the lens off a dry eye |
| Rest of the day | Switch to glasses if you can. Monitor symptoms. | Don't put the same lenses right back in and "reset the clock" |
| Next 24 hours | If you have redness, pain, light sensitivity, discharge, or sudden blurry vision, stop lens wear and call an eye doctor right away. | Don't self-treat suspected infection with random drops and delay care |
If you slept in reusable lenses, treat the pair as “questionable.” If they were in your eyes during a long sleep, many clinicians will tell you to discard them, then start fresh with a new pair once your eyes feel normal. If you’re unsure, ask your eye doctor.
What If the Lens Feels Stuck?
A stuck lens is usually a dry lens, a lens that slid under the lid, or a torn lens.
A safe approach looks like this:
- Re-wet the eye with sterile saline, rewetting drops, or sterile eyewash for a few seconds.
- Blink a lot, look around, then try removal again gently.
- If you can’t find it, check under the upper lid carefully in a mirror.
Avoid rinsing your lens, case, or eye with tap water. CDC and Moorfields both warn against water exposure with lenses because it raises infection risk.
If you feel sharp pain, see a visible white spot on the cornea, or symptoms keep escalating, stop and get checked.
When Should You Get Same-Day Care?
Use this as a simple trigger list. These are classic microbial keratitis warning signs.
| Symptom | What to do |
|---|---|
| Red eye plus worsening pain, even after lens removal | Remove lenses and call an eye doctor immediately |
| Light sensitivity that feels intense | Same-day evaluation is smart |
| Sudden blurry vision | Same-day evaluation |
| Watery eye that is unusual, or discharge | Same-day evaluation |
Real-Life Situations Where People End Up Sleeping in Contacts
This is where some of the resources you’ll find can get vague. Here’s a practical playbook:
| Situation | The safer move | The backup plan that prevents a bad decision |
|---|---|---|
| Red-eye flight or long travel day | Take lenses out before you try to sleep | Carry glasses, a case, and solution (CDC calls this out) |
| Camping or festival | Go glasses-first | Daily disposables plus a strict “remove before sleep” rule |
| New parent, broken sleep | Stick to glasses during the rough weeks | If you wear lenses, set a phone alarm to remove them before bed |
| Night shift nap in the car | Remove lenses before the nap | Keep rewetting drops and glasses in your bag |
| Wedding, party, alcohol | Switch to glasses late-night | Dehydration makes lenses feel glued on, which makes removal rough |
| You’re sick and falling asleep on the couch | Glasses | If you must wear lenses, make “remove at first yawn” your rule |
Why Some Contacts Are FDA Approved for Overnight Wear
This is where it gets slightly confusing (but not really). “FDA approved for overnight wear” does not mean “safe to sleep in whenever you feel like it.” It means the lens is specifically cleared for an extended-wear schedule on its label, with a defined max number of nights (often 1–6 nights, and in a few cases up to 30 days), and only for people an eye care provider thinks can tolerate it.
What’s Different About Overnight-Approved Lenses?
They’re built for the closed-eye problem.
When you sleep, your cornea gets far less oxygen than when your eyes are open. Extended-wear lenses are typically made from materials designed to let more oxygen pass through the lens to the cornea, and newer soft-lens materials include silicone hydrogels for that reason.
You’ll also see this described using oxygen transmissibility (Dk/t) on regulatory or manufacturer materials. Higher Dk/t is one reason some lenses can be labeled for extended wear, while many standard daily-wear lenses are not.
What Does “Approved” Cover?
Approval is tied to a specific wear schedule and care instructions.
For example, one FDA Summary of Safety and Effectiveness document for a silicone hydrogel lens spells out that it “may be prescribed for Extended Wear for up to 6 nights and 7 days,” recommends being evaluated on a daily-wear schedule first, and requires specific cleaning and disinfection when used as a re-wear lens.
That’s the pattern: the label is the rulebook. “Approved” means “approved under these conditions,” not “approved no matter what.”
A List of FDA-Approved Contacts for Overnight Wear
| Contact Lens | Replacement Schedule | Water Content |
|---|---|---|
| AIR OPTIX NIGHT & DAY AQUA | Monthly | 24% |
| Air Optix for Astigmatism | Monthly | 33% |
| Biofinity | Monthly | 48% |
| Biofinity Toric | Monthly | 48% |
| Biofinity Multifocal | Monthly | 48% |
| Biofinity Energys | Monthly | 48% |
| Bausch + Lomb ULTRA | Monthly | 46% |
| PureVision | Monthly | 36% |
| PureVision 2 HD | Monthly | 36% |
| PureVision 2 HD for Astigmatism | Monthly | 36% |
| PureVision 2 Toric | Monthly | 36% |
| PureVision 2 Multifocal | Monthly | 36% |
| PureVision Toric | Monthly | 36% |
| PureVision Multi-focal | Monthly | 36% |
| AIR OPTIX Plus Hydraglyde | Monthly | 33% |
| AIR OPTIX AQUA Multifocal | Monthly | 33% |
| AIR OPTIX AQUA | Monthly | 33% |
A Commentary on What People Are Saying on Reddit
A Reddit thread on sleeping in contact lenses is basically two camps. One group says, “Don’t do it, I got burned.” The other says, “I’ve done it for years, I’m fine.” Both are real experiences, but they don’t carry the same weight for decision-making.
What the Thread Gets Right
Sleeping or even napping in contacts is a high-risk habit. That matches why so many commenters mention ulcers, infections, and painful abrasions. Microbial keratitis is a serious corneal infection and in severe cases can lead to permanent vision damage or a corneal transplant.
Where the Thread Goes Sideways
Some commenters say “just get the ones you can sleep in,” as if that flips the risk off. Extended-wear lenses exist, and the FDA describes them as approved for overnight or continuous wear ranging from one to six nights or up to 30 days, depending on the lens and your eye doctor’s evaluation of your tolerance. They’re typically made from materials that let more oxygen pass through to the cornea.
That is not permission to freestyle. “FDA-cleared for overnight” means “cleared under a specific schedule,” and the CDC still treats sleeping in lenses as a major risk behavior.
Also, a few claims in the thread are simply wrong:
- “Ulcer on the retina” is not the usual contact lens complication people are warning about. The focus is the cornea, the front clear surface (CDC).
- “Astigmatism makes it safe” is just a pattern people noticed in replies, not a protective factor.
Our Takeaway
If you sleep in contacts “for weeks at a time” and nothing has happened yet, that’s luck, not proof it’s safe. The real risk is low-frequency but high-consequence, and it can show up after years of getting away with it.
If your lifestyle makes nightly removal hard, talk to your eye doctor about options that match how you really live, like daily disposables, better comfort strategies, or an extended-wear lens only if you’re a good candidate. Then stick to the schedule.
The Final Word
Sleeping in contacts is one of the fastest ways to turn a normal “I wear contacts” routine into a scary eye problem.
If you accidentally do it, remove them gently, give your eyes a break, and take any warning symptoms seriously. If you’re shopping for contacts or thinking about switching to a modality that fits your lifestyle better (like daily disposables or an extended-wear option your eye doctor approves), Lens.com can help you compare options and refill your prescription once you’ve had a current exam.
Sources
CDC, “Corneal Infections Associated with Sleeping in Contact Lenses,” MMWR
CDC, “Contact Lens–Related Corneal Infections — United States, 2005–2015,” MMWR (2016)
CDC, “What Causes Contact Lens-related Eye Infections” (symptoms and actions)
CDC, “Preventing Eye Infections When Wearing Contacts”.
CDC, “Healthy Habits: Keeping Water Away from Contact Lenses”
FDA, “Types of Contact Lenses” (extended wear definition).
American Academy of Ophthalmology, “What Is Orthokeratology?”
Fleiszig et al., “The Pathogenesis of Contact Lens-Associated Microbial Keratitis” (2010).
Muntz et al., “Tear exchange and contact lenses: a review” (2015).
Shin et al., “Changes in the Eye Microbiota Associated with Contact Lens Wear,” mBio (2016).
Stapleton, “The epidemiology of microbial keratitis with silicone hydrogel contact lenses” (2013).
Holden & Mertz, “Oxygen transmissibility and corneal edema” (1984).
Moorfields Eye Hospital, “Care of your soft contact lenses” and “Five golden rules for safe contact lens use.”
ACUVUE, “Why you shouldn’t fall asleep with contact lenses on”
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