Updated on  February 12, 2024
6 min read

What Happens If You Sleep in Contacts?

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Key Takeaways

  • Nearly 45 million people in the U.S. wear contact lenses, and about one-third have slept in their contacts at least once.6 
  • If you fall asleep with your contacts, you may only wake up with dry, irritated eyes. However, the consequences can be much worse.
  • Sleeping with contacts makes you 6 to 8 times more likely to get an eye infection.
  • If you accidentally fall asleep in your contacts, carefully remove them and wear glasses for the next day.

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Why You Shouldn’t Sleep in Your Contact Lenses

Sleeping or napping in your contact lenses dramatically increases the risk of eye infection, especially microbial keratitis. This eye condition affects the cornea (the lens on the front surface of your eye, directly beneath your contact).

Bacteria usually cause microbial keratitis but can also be fungal, viral, or parasitic. Without treatment, microbial keratitis can lead to permanent vision loss.

stack of disposal contact lense isolated on white

Even if you sleep in your contacts occasionally or by accident, your risk for infection still increases. Many ophthalmologists advise against contact lenses marketed for continuous wear because they also raise the risk of a severe eye infection.2 

Non-prescription contact lenses can also result in serious eye problems and lead to a corneal transplant. If you wear these overnight, the risk increases. Speaking with an eye doctor before using this type of lens is essential.

What Happens When You Sleep in Contacts? 

When you sleep with contact lenses, your eyes can’t breathe properly. Without sufficient oxygen, cells in the cornea go into a state of oxygen deprivation called hypoxia. 

Low oxygen levels promote bacterial growth, increasing the risk of infections leading to corneal damage and vision loss. These include:

Bacterial Keratitis

This is the most common type of keratitis. It involves corneal inflammation caused by a bacterial infection. Bacterial keratitis can occur when bacteria from your fingers, contact lens, or storage case enter your eye.

Wearing contacts overnight increases your risk for bacterial keratitis. Rinsing your lenses in tap water instead of contact solution raises your risk.

Fungal Keratitis

A fungal infection causes this type and is more common in tropical climates. However, fungal keratitis can happen to people anywhere in the world.

Signs and Symptoms of an Eye Infection

Here is a list of symptoms associated with contact lens-related corneal infections:

  • Blurry vision
  • Unusual redness of the eye
  • Swelling
  • Eye pain or discomfort
  • Itchy eyes or a burning sensation
  • Excessive tearing
  • Eye discharge
  • Extra sensitivity to light 
  • A feeling of something in the eye

Call your eye doctor at the first signs of infection. Left untreated, keratitis can lead to permanent corneal damage and vision loss.

Other Risks of Sleeping with Contacts 

Microbial keratitis isn’t the only problem to worry about. Sleeping in contact lenses also increases your risk for:

If you fall asleep with debris stuck beneath a contact lens, you might wake up with a scratched or damaged cornea.

How to Treat Your Eyes After Sleeping in Contacts

If you fall asleep with your contact lenses still in, there are a couple of steps you should take immediately afterward:

Remove Contact Lenses

Take out your contacts as soon as possible. Doing this will lessen your risk of infection and further eye dryness. 

If you find it difficult, place several drops of contact lens rewetting drops in your eyes and blink. This should help dislodge the lenses for easier removal.

You want to remember not to pull at the contact lenses. This tugging motion could cause abrasions to the surface of your eye. 

Wear Eyeglasses for at Least a Day

Hold off on wearing contact lenses for one whole day. You want to rest your eyes and let them breathe again. 

Also, be on the lookout for any possible infection symptoms. If you notice something strange, contact your ophthalmologist or optometrist. 

Schedule an Eye Exam if Needed

Regarding eye infections, it’s better to be extra cautious. Call your eye doctor immediately if you experience any changes to your vision or signs of infection.

If you schedule an appointment, bring your contact lenses in their storage case. Your eye doctor can culture the lens to understand and treat the source of your eye problem. 

Prevent Accidentally Sleeping in Your Contacts

People who accidentally fall asleep with their contacts may benefit from setting an alarm or other reminder to remove them.

What Contacts are Approved for Sleeping?

The United States Food and Drug Administration (FDA) has approved different contact lenses for day and overnight wear. These include:

Extended Wear

Continuous use or extended wear contacts claim to be safe to wear overnight from one to six nights or up to 30 days. However, many eye doctors recommend against this. The risk of microbial keratitis is higher in people who use extended-wear lenses. 

Because these lenses are made of flexible silicone hydrogel plastics, more oxygen can reach the cornea. You’ll see that most extended-wear contact lenses are often soft contact lenses.

Only a few rigid gas permeable (RGP) lenses are available and suitable for overnight wear. After each scheduled removal of these contact lenses, eye care professionals recommend resting your eyes for at least one day and wearing eyeglasses. 

Overnight Orthokeratology (Ortho-k) Lenses

Ortho-k contact lenses help change the curvature of the cornea. In doing so, the eye can focus on objects better. Eye care professionals often prescribe this contact lens for people with myopia (nearsightedness).

If you use Ortho-k lenses, you may be recommended to sleep with them for at least 8 hours per night. Ortho-k lenses are removed in the morning, and the wearer can enjoy clearer vision throughout the day without glasses or contacts.

Frequently Asked Questions (FAQs)

What if I accidentally fall asleep in contacts one night?

If you fall asleep with your contact lenses still in, follow our instructions to treat your eyes after sleeping in contacts (provided above).

Don’t beat yourself up about it. Millions of people sleep with their contacts in, and some regularly. Forgive yourself, and set the alarm or reminder to remove your contacts the next day. 

Can you sleep with contacts for one hour?

Sleeping with them for one hour is possible with extended-wear contact lenses. But each time you sleep with contacts, even if for an hour, you increase your risk of an eye infection. It is recommended to avoid falling asleep with the contact lenses still in. 

How does sleeping in contacts raise your risk of infection?

Sleeping in contact raises your risk of infection because your eye does not receive enough oxygen or moisture to fight off infection. Also, certain bacteria like Pseudomonas aeruginosa may find it easier to colonize the contact lenses if left in for extended periods. 

Can sleeping with contacts cause headaches?

Sleeping with contacts may cause headaches, although not always. The headaches may occur because of dry eyes caused by the lack of oxygen flow and moisture. 

When you have dry eyes, you can become more sensitive to light and squint in response. This constant squinting can sometimes trigger a muscle tension headache. 

When should I see my doctor?

You should visit your ophthalmology clinic if you suspect you have an eye infection. You must bring your contact lens case with you. Don’t throw your lenses away.

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Updated on  February 12, 2024
6 sources cited
Updated on  February 12, 2024
  1. Boyd, K. “Eye Infections From Contact Lenses.” American Academy of Ophthalmology, 2021.

  2. Boyd, K. “Contact Lenses for Vision Correction.” American Academy of Ophthalmology, 2022.

  3. Fleiszig, SMJ., Evans, DJ. “The Pathogenesis of Contact Lens-Associated Microbial Keratitis.” Optometry and Vision Science: Official Publication of the American Academy of Optometry, 2010.

  4. Show Me the Science: Data Behind Contact Lens Wear and Care Recommendations.” Centers for Disease Control and Prevention, 2022.

  5. Turbert, D. “What Is Bacterial Keratitis?” American Academy of Ophthalmology, 2022.

  6. Cope et al. “Corneal Infections Associated with Sleeping in Contact Lenses – Six Cases, United States, 2016-2018.” Morbidity and Mortality Weekly Report (MMWR), 2018.

The information provided on VisionCenter.org should not be used in place of actual information provided by a doctor or a specialist.