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The short answer For blocking light, fit beats fabric. Look for a contoured mask with molded eye cups, a padded nose bridge that sits flush against your face and a wide, adjustable strap. Side sleepers need thin, tapered edges. Before you trust any mask, test it with your eyes open in a lit room: if you see light at the nose or cheeks, it will leak at dawn too.
- A nose bridge that seals. The gaps beside your nose are a common leak point. A padded or shaped nose flap closes them.
- Eye cups or enough depth so nothing presses on your eyelids or lashes.
- A wide, adjustable strap that holds the mask in place without squeezing. Snug, not tight.
- Low-profile sides if you sleep on your side, so the pillow doesn’t shove the mask off your eyes.
- An opaque, dark inner layer. Thin fabric that looks dark can still glow when light hits it.
- Soft material against the skin and no rough seams near the eyes.
- Washable, or with a removable cover, since it sits on your face every night.
- No hard parts (buckles, thick velcro) where your head rests.
Why blocking light at night matters
Your brain treats light as a signal that it’s daytime. In one lab study, ordinary room light during the usual hours of sleep suppressed melatonin by more than 50% in most trials. In another, sleeping one night with moderate overhead light on, eyes closed, raised nighttime heart rate and next-morning insulin resistance compared with sleeping in near-darkness.
Do masks themselves help? The direct research is thin but encouraging. In a 2023 study, young adults who slept in a light-blocking eye mask for a week did better on next-day memory and alertness tests than when they wore a mask with holes cut over the eyes. Their sleep diaries showed no difference in how long or how well they slept, so the benefit showed up in performance rather than in how the night felt. A Cochrane review of hospital intensive care units found low-quality evidence that earplugs, eye masks or both may improve sleep, though most trials that measured sleep objectively found no benefit.
Cleveland Clinic’s summary is fair: there isn’t a lot of research on sleep masks, but many people find them useful, especially if they sleep during the day.
Contoured vs flat masks
This is the main choice you’ll make, and it decides how well the mask blocks light.
| Contoured (molded cups) | Flat (fabric or padded) | |
|---|---|---|
| Light blocking | Usually better; the shaped rim sits on bone around the eyes | Depends on fit; gaps at the nose are common |
| Pressure on eyelids | None if the cups are deep enough | Rests directly on the lids |
| Lashes and extensions | Room to blink | Can bend lashes |
| Side sleeping | Can be bulky; look for tapered edges | Thin, but can slide when your face meets the pillow |
| Travel | Takes more space | Folds into a pocket |
| Good fit for | Daytime sleepers, bright rooms, anyone who dislikes eyelid pressure | Light sleepers in fairly dark rooms, travelers, people who hate bulk |
For most people trying to block real light, such as streetlights, early summer sunrise or a day-sleep schedule, we’d start with a contoured mask. A flat mask is fine if your room is already fairly dark and you just want a little extra.
How to test whether a mask actually blocks light
- Put it on in a bright room and open your eyes. Look down toward your cheeks and along your nose. Any glow you see now is the glow you’ll get at 6 am in June.
- Lie down in your usual position. Side sleepers especially: press your face into the pillow and check again, because masks often lift on the side facing up.
- Blink a few times. If your lashes brush the fabric or the lids feel pressed, the cups are too shallow or the strap is too tight.
- Loosen the strap one notch and repeat. Many leaks come from a strap so tight it tilts the mask off your nose.
- Wear it for a few nights before deciding. Researchers in the 2023 mask study gave people five nights to get used to the mask before testing anything; give yourself the same.
Choosing a mask for your situation
If you sleep on your side
Look for a mask that gets thinner toward the temples and a strap that sits flat, without a bulky adjuster where your ear meets the pillow. Contoured masks with tapered sides tend to stay sealed better than floppy flat ones, which slide when you roll. If you also wear earplugs, check that the mask’s edge doesn’t press on them; our earplug comparison covers which types sit flattest.
If you sleep during the day
Shift workers need the most complete blackout. NIOSH’s guidance for night-shift nurses is to make your sleep space so dark you can’t see your hand in front of your eyes, or wear an eye mask, because daylight triggers waking. A mask is the cheapest way to get there. Pair it with blackout curtains if you can, so the room stays dark if the mask slips off.
If you travel
Planes, hotel rooms and shared spaces all come with light you can’t control. A mask that packs flat matters more here, and a contoured mask with a slim profile is a good middle ground. Pack earplugs with it.
If you have long lashes or lash extensions
Choose deep eye cups so nothing touches your lashes. A flat mask pressing on extensions all night can bend them.
If you wake with dry, irritated eyes
Some people don’t fully close their eyes during sleep, a condition called nocturnal lagophthalmos. A partner may notice it before you do. Cleveland Clinic notes a sleep mask or other eye covering can help keep irritants away, but treatment can also include night ointment, eyelid taping or special moisture goggles. That’s a conversation for an eye doctor, not a shopping decision.
Heated, cooling and weighted masks
These are comfort features, not light-blocking ones. Cleveland Clinic describes heated masks as relaxing for some people with dry eyes or eye strain, cooling masks as soothing if you run warm or wake with puffy eyes, and weighted masks as adding gentle pressure some people find calming. Warm compresses are a standard part of treating blepharitis, an eyelid condition, so a heated mask may suit you if your eye doctor recommends warmth. If a weighted mask rests its weight on your eyes, that conflicts with the usual advice to avoid pressure on them. Check that any mask you plan to sleep in still seals out light.
Materials: silk, cotton and foam
Silk feels smooth and light on the skin; Cleveland Clinic calls it a favorite for people who want a lightweight, cooling feel. Cotton breathes well and is easy to wash. Molded foam holds the contoured shape that keeps the mask off your eyes. Plenty of good masks combine them, with a foam shell and a soft fabric facing.
Claims that a silk mask prevents wrinkles come mostly from companies selling silk masks. We couldn’t find clinical evidence either way, so pick the fabric that feels best and blocks light.
Wash your mask regularly, or rotate two. It sits on skin oils, sweat and any night creams around your eyes every night. Check the label, since some molded masks are hand-wash only.
Is it OK to wear a sleep mask every night?
For most healthy adults, yes, as long as it fits well. The main rules from Cleveland Clinic are a mask that fits snugly without feeling tight and blocks light without putting pressure on your eyes. If you wake with red marks, a headache or sore eyes, loosen the strap or switch to a contoured design.
If you’ve had recent eye surgery or an eye injury, follow your surgeon’s instructions about eye coverings instead.
When to see a doctor
- You regularly wake with dry, gritty, red or painful eyes, or someone tells you your eyes stay partly open while you sleep.
- Your room is dark and quiet but you still can’t fall asleep or stay asleep at least three nights a week for three months. That’s chronic insomnia, and a mask won’t fix it.
- You snore loudly, gasp at night or feel sleepy all day. That can point to sleep apnea.
A mask handles light. For the rest of the room, see the best temperature for sleep and white, pink and brown noise, or browse more sleep gear guides.
Common questions
Are contoured sleep masks better than flat ones?
For blocking light, usually. Molded eye cups keep the mask off your eyelids and let the rim sit flush around your eyes, while flat masks often leave gaps beside the nose. Flat masks are thinner and pack smaller.
What is the best sleep mask for side sleepers?
Look for a low-profile mask with edges that taper toward the temples and a flat strap without a bulky adjuster near the ears. Test it lying on your side, since masks often lift on the upward-facing side.
Is it bad to sleep with a sleep mask every night?
For most healthy adults it's fine if the mask fits snugly without pressing on your eyes. Wash it regularly, and see an eye doctor if you often wake with dry, red or painful eyes.
Do sleep masks actually help you sleep?
Research is limited. A 2023 study found people who wore a light-blocking mask did better on next-day memory and alertness tests, though they didn't report sleeping longer or better.
Written and checked by the Sleep Brief editors. We base every article on published research and guidance from medical bodies, and link the sources inline. How we research.
This article is for general education and isn't medical advice. If poor sleep lasts more than a few weeks, or you snore loudly, stop breathing in your sleep or feel sleepy while driving, talk to a doctor.
