Quick Answer: You should not sleep in contact lenses. Even a short nap cuts the oxygen supply your cornea needs, raising infection risk by 6 to 8 times. Remove lenses before bed every night. If you accidentally fall asleep wearing them, remove them carefully, re-hydrate your eyes with preservative-free drops, and monitor for redness or pain.
In This Guide
- What Happens to Your Eyes When You Sleep in Contacts
- Oxygen Deprivation: Why It Matters
- Infection Risks and How Serious They Get
- What to Do If You Fall Asleep in Your Contacts
- Are Extended-Wear Lenses Actually Safe Overnight?
- Better Sleep Habits for Contact Wearers
- When to See a Doctor
- Frequently Asked Questions
Reading Time: 13 minutes
It happens to almost every contact lens wearer at least once. You settle into your favourite spot, maybe on the couch after a long day, maybe in bed just to rest your eyes for a moment, and the next thing you know it is morning. Your eyes feel dry, gritty, and a little glued together. And your lenses are still in.
Occasional accidents happen. But if sleeping in contacts is a regular habit, or if you are wondering whether it is ever truly safe, the answer from eye care professionals is consistent and clear. It is not recommended, and the risks are real.
This guide covers exactly what happens to your eyes while you sleep in lenses, what to do if it occurs, and how to build better bedtime habits that protect your vision. We also touch on how quality sleep, on a supportive mattress in a comfortable bedroom, can actually reduce the likelihood of accidental contact-related issues in the first place.
What Happens to Your Eyes When You Sleep in Contacts
Your cornea is the clear dome at the front of your eye. Unlike most tissues in your body, the cornea does not have blood vessels. Instead, it gets the oxygen it needs directly from the air. During the day, your open eyes absorb oxygen continuously. At night, your eyelids close and oxygen supply drops significantly. Your cornea manages this by slowing its metabolism and drawing a small amount of oxygen from the tears underneath.
When you add a contact lens into that equation, you create a physical barrier between the cornea and the tear film. The lens traps carbon dioxide, disrupts tear circulation, and reduces the already-limited overnight oxygen supply further.
What Research Shows About Overnight Contact Use
A large prospective study published in Ophthalmology found that overnight contact lens wear increased the risk of microbial keratitis (corneal infection) by 6.9 times compared to daily wear only. The U.S. Centers for Disease Control and Prevention (CDC) estimates that roughly one million doctor and emergency visits each year in the United States are related to contact lens infections, with overnight wear identified as a primary contributing factor. Canadian ophthalmologists align with these findings.
Oxygen Deprivation: Why It Matters
Corneal hypoxia is the technical term for what happens when your cornea does not get enough oxygen. Symptoms range from mild discomfort to serious structural changes over time.
In the short term, a night in contacts can cause:
- Redness and irritation when you wake up
- Blurry vision that takes time to clear
- A dry, scratchy sensation, as though something is stuck in your eye
- Increased light sensitivity
- Difficulty removing the lens because it has dried and adhered slightly to the surface
Over the longer term, repeated oxygen deprivation can cause the cornea to grow new, unwanted blood vessels in a process called neovascularisation. These vessels can impair vision and complicate future contact lens use. In severe cases, they can affect candidacy for laser eye surgery.
The cornea also swells slightly when deprived of oxygen, a temporary change that can blur vision for an hour or more after waking. This swelling increases the risk of small abrasions when you try to remove a dry, adhered lens.
Infection Risks and How Serious They Get
The infection concern is where things get serious. Acanthamoeba keratitis is a rare but devastating corneal infection caused by a microscopic organism found in water and soil. Contact lens wearers, particularly those who sleep in lenses or expose them to water, are at significantly elevated risk. It can cause permanent vision loss and is notoriously difficult to treat.
More commonly, Pseudomonas aeruginosa and Staphylococcus aureus bacteria can colonise the space between a lens and a hypoxic cornea. The lack of oxygen and disrupted tear flushing create conditions where bacteria can multiply rapidly overnight.
Warning Signs of a Contact Lens Infection
- Sudden eye pain: Particularly if it comes on quickly after waking with lenses in.
- Severe redness: The whites of your eye turning deep red is not normal post-nap irritation.
- Discharge: Yellow or green discharge, or crusting around the eye.
- Light sensitivity: Significant photophobia that does not resolve with lens removal.
- Vision changes: Blurring that does not clear within an hour of removing lenses.
If you experience any of these after sleeping in contacts, do not wait to see if it improves. Contact an optometrist or go to an emergency eye clinic. Corneal infections treated early usually respond well. Left too long, they can scar the cornea permanently.
Dorothy, Sleep Specialist: "We talk a lot about sleep hygiene in the context of mattresses and pillows, but what you do right before bed matters too. Removing contact lenses is one of those simple habits that protects your health while your body does the repair work it needs at night. Good sleep starts with a good bedtime routine."
What to Do If You Fall Asleep in Your Contacts
Accidents happen. Here is the sensible protocol if you wake up with lenses still in.
Step-by-Step: Removing Contacts Safely After Sleeping in Them
Step 1: Do Not Pull the Lens Off Immediately
Your cornea may be dry and slightly swollen. A dry lens adhered to the eye can cause a small abrasion if removed forcefully. Wait before attempting removal.
Step 2: Apply Preservative-Free Saline or Rewetting Drops
Use preservative-free saline solution or contact lens rewetting drops, not tap water. Blink several times to allow the drops to work under the lens. Give it at least 60 seconds.
Step 3: Attempt Gentle Removal
With clean, dry hands, gently slide the lens to the white of your eye, then pinch it off. If there is resistance, add more drops and wait longer. Never force it.
Step 4: Do Not Re-Insert the Lenses
Discard daily lenses immediately. If wearing reusable lenses, clean and disinfect them thoroughly before any future use. Give your eyes at least one full day with glasses only.
Step 5: Monitor Your Eyes for 24 to 48 Hours
Watch for increasing redness, pain, or discharge. If symptoms worsen or do not resolve, see an eye care professional promptly. Do not resume lens wear until your eyes are fully clear.
Are Extended-Wear Lenses Actually Safe Overnight?
Some contact lenses are approved by Health Canada for extended wear, including overnight use. Silicone hydrogel lenses transmit significantly more oxygen than traditional hydrogel lenses, and certain brands are labelled for up to 30 consecutive nights of wear with a doctor's approval.
It is important to understand what "approved for overnight wear" actually means, though. It does not mean the risk disappears. It means the risk is lower than with standard lenses, not zero.
| Lens Type | Oxygen Transmissibility (Dk/t) | Overnight Approval | Relative Infection Risk |
|---|---|---|---|
| Standard hydrogel daily | Low (20-30) | No | Highest |
| Standard hydrogel reusable | Low-medium (25-35) | No | High |
| Silicone hydrogel daily | High (60-170) | No (daily wear only) | Lower, but not for overnight |
| Silicone hydrogel extended wear | Very high (100-175) | Yes (with Rx) | Reduced but still present |
If you are considering extended-wear lenses specifically because you frequently fall asleep in your contacts, talk to your optometrist. They can assess whether your eyes are suitable candidates and give you a supervised trial. Do not switch independently based on marketing claims.
Better Sleep Habits for Contact Wearers
The best way to avoid sleeping in contacts is to build lens removal into your wind-down routine before tiredness wins.
Many people who accidentally fall asleep in their lenses do so because they delay removing them until they are already lying down and struggling to stay awake. The solution is straightforward: make lens removal one of the first steps in your evening routine, before you get into bed, before you turn off the lights, and certainly before you decide to rest your eyes for just a moment.
Building a Lens-Safe Bedtime Routine
Keep your lens case and solution on your bathroom counter where you cannot miss them during your evening routine. Remove lenses immediately after dinner if you tend to fall asleep early. Set a phone reminder for 9 pm if needed. The goal is to make removal automatic, not something that requires willpower at the end of a long day.
There is also a connection between sleep quality and these sorts of accidental oversights. When you are chronically overtired or sleeping poorly, your body will find sleep wherever it can, often before you have finished your usual routines. If you are regularly falling asleep on the couch or struggling to stay awake long enough to complete basic tasks, the quality of your sleep environment is worth examining.
A supportive mattress that reduces discomfort, proper pillow alignment that eases you into sleep rather than keeping you up with neck aches, and a bedroom that is dark, cool, and quiet all contribute to sleeping at the right time and in the right place. When you sleep well at night, you are less likely to doze off unexpectedly during the evening. You can browse our mattress and bedding collections for ideas on how to improve your sleep environment.
Dorothy often tells customers who are dealing with poor sleep that the bedroom itself sends signals to your brain. A good mattress, the right pillow, breathable sheets, and a dark room tell your body that sleep is coming, which helps you wind down properly, complete your routine including removing contact lenses, and get into bed intentionally rather than collapsing wherever you happen to land.
If you find that poor sleep is a recurring theme, our article on how to sleep through the night may be helpful, as well as our piece on sleep hacks that actually work. And if discomfort is keeping you awake, our guide to lower back pain in bed covers some practical solutions.
A Note From Our Brantford Team
At Mattress Miracle, we have been helping Brantford families sleep better since 1997. We are not eye doctors, but we understand how deeply sleep quality affects every aspect of your health. Customers often tell us that after upgrading to the right mattress, they sleep more soundly and wake up feeling genuinely rested. When that happens, the small evening rituals like removing contact lenses before bed become much easier to maintain.
When to See a Doctor
Most people who accidentally sleep in contacts once will experience minor irritation that clears up within a few hours of lens removal and rest. But there are situations where you should see an eye care professional without delay.
See a doctor if:
- Pain does not subside after removing lenses and using rewetting drops
- Redness is severe or does not improve within a few hours
- You notice any clouding or haziness on the cornea
- You have discharge that is yellow or green
- Your vision is affected beyond temporary blurring
- You develop significant light sensitivity
- Symptoms worsen over 24 hours rather than improving
In Canada, you can see your optometrist, visit a walk-in clinic with eye care experience, or go to a hospital emergency department for urgent eye issues. Corneal infections are considered emergencies because of how quickly they can progress. Do not wait for a regular appointment if symptoms are worsening.
The Connection Between Fatigue and Eye Health
A study published in Investigative Ophthalmology and Visual Science found that sleep deprivation measurably reduces tear production and increases dry eye symptoms. Chronically tired people experience more eye discomfort overall, which can make contact lens wear less comfortable during the day and more likely to be forgotten at night when exhaustion sets in. Improving overall sleep quality has documented benefits for ocular surface health.
And if contact lens wear is causing regular discomfort or inconvenience, it may be worth discussing laser vision correction with an ophthalmologist. Many Brantford residents have found that addressing their vision needs permanently makes their sleep routines simpler. That is a conversation for your eye doctor, but worth mentioning.
Find Your Perfect Mattress at Mattress Miracle
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Call 519-770-0001Frequently Asked Questions
Can you sleep in contacts for a short nap?
Even a 20-minute nap with contacts in reduces corneal oxygen supply and increases infection risk compared to wearing no lenses. It is better to remove lenses before any sleep, including short naps. If you know a nap is coming, take them out first. The habit takes seconds and protects your vision.
What happens if you sleep in contacts every night?
Regular overnight wear of lenses not approved for extended use significantly raises your cumulative risk of microbial keratitis, corneal neovascularisation, and chronic dry eye. Over months and years, repeated hypoxia can alter corneal structure and make contact lens wear increasingly uncomfortable. Some people develop conditions that permanently affect their ability to wear lenses at all.
Are there contact lenses you can sleep in?
Yes. Certain silicone hydrogel lenses are approved by Health Canada for overnight or continuous wear of up to 30 nights, when prescribed by an optometrist. These lenses transmit much more oxygen than standard lenses, but the risk of infection is still elevated compared to removing lenses nightly. Your optometrist can advise whether extended-wear lenses are appropriate for your eyes specifically.
My eye feels fine after sleeping in contacts. Do I still need to see a doctor?
If you slept in contacts once, feel no pain, see no redness, and your vision is clear after lens removal, you likely do not need an emergency visit. Monitor your eye for 24 to 48 hours. If any symptoms develop or worsen, see a professional promptly. If it happens regularly, discuss extended-wear options or lens-free alternatives with your optometrist.
Can sleeping in contacts cause permanent damage?
A single incident is unlikely to cause permanent damage if managed correctly. Repeated overnight wear, however, can lead to lasting changes including corneal scarring from infection, chronic neovascularisation, and persistent dry eye that does not fully resolve even after stopping lens use. This is why the habit matters more than any single incident.
Sources
- Stapleton, F., et al. (2012). The epidemiology of contact lens related infiltrates. Optometry and Vision Science, 89(10), 1355-1364. doi.org/10.1097/OPX.0b013e318269abe6
- Dart, J.K., et al. (2008). Risk factors for microbial keratitis with contemporary contact lenses: a case-control study. Ophthalmology, 115(10), 1647-1654. doi.org/10.1016/j.ophtha.2008.05.003
- Centers for Disease Control and Prevention. (2022). Contact lens health. CDC.gov. cdc.gov/contactlenses/index.html
- Holden, B.A., & Mertz, G.W. (1984). Critical oxygen levels to avoid corneal edema for daily and extended wear contact lenses. Investigative Ophthalmology & Visual Science, 25(10), 1161-1167. iovs.arvojournals.org
- Uchino, M., et al. (2013). Prevalence of dry eye disease and its risk factors in visual display terminal users: The Osaka study. American Journal of Ophthalmology, 156(4), 759-766. doi.org/10.1016/j.ajo.2013.05.040
- Health Canada. (2019). Contact lenses: Safety and effectiveness. Canada.ca. canada.ca
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If poor sleep is making your evenings harder to manage, come in and let us help you find a mattress and sleep setup that has you winding down properly every night. Small habits like removing contact lenses before bed are a lot easier when sleep is not a struggle.
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