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Listening at home⏱️ Estimated reading time: 12 min
On this page: Overview
Key Takeaways
One that stays thin and flexible at the sides, keeps contact with your face at the nose bridge when the pillow presses on it, and fastens with a flat strap above the ears with nothing hard under your temple. Cup masks and flat masks can both work on your side. Bulk and hard buckles are what fail.
Wear the strap above your ears, settle the mask before you lie down, and choose a strap that holds its tension instead of elastic that slowly relaxes. Our Deep Sleep Mask has an adjustable Velcro strap that holds its tension and won’t degrade or pull hair.
Yes. Put the earplugs in first, then run the mask strap above your ears so it never sits over them. Low-profile earplugs that sit flush in the ear are the most comfortable choice on the pillow side.
Most advice on picking a sleep mask is written for back sleepers. On your side, half your face is pressed into the pillow, and every time you turn over the pillow pushes the mask a little further sideways and up. A good sleep mask for side sleepers has to stay put and keep the pillow side dark, and do both without pressing anything hard into your temple.
Side sleepers put it more bluntly. One said the pillow “pushes against the face and it’s all wonky”, and another still had light seeping in around the nose while dozing off on their side. Neither mask was faulty. That is simply what happens when a mask meets a pillow at an angle.
NHS sleep advice suggests “wearing an eye mask if light is still a problem” (NHS Every Mind Matters). At Bollsen, we are a family-owned hearing protection company trusted by 1,000,000+ people, and we make the Deep Sleep Mask in natural mulberry silk for the light half of a quiet night. On your side, though, the mask that works is decided by profile, strap and the pillow-side seal far more than by any brand.
What kind of sleep mask works best for side sleepers?
The best sleep mask for side sleepers is thin and flexible enough to compress against the pillow without lifting off the face, is held by a flat strap worn above the ears with no buckle at the side, and fits closely enough at the nose bridge that the pillow side stays dark.
Shape matters less than most product pages suggest. Cup masks and flat masks can both work on your side; what fails is bulk, either thick padding that the pillow presses into your temple or a stiff edge that the pillow levers away from your cheek. Hardware is the other usual culprit, because a plastic slider under your ear on a firm pillow is something you feel all night.
A quick test tells you most of it. Look at how thick the mask is at the sides and whether the strap lies flat. Then press the mask with your palm, the way the pillow will, and check that the lower edge still touches your cheek.
Music SoundPRO★ 4.8 · 514 reviews
Watersafe+★ 4.8 · 684 reviews
Life+★ 4.7 · 3,700 reviewsLife+★ 4.7 · 3,700 reviewsMusic SoundPRO★ 4.8 · 514 reviewsWatersafe+★ 4.8 · 684 reviewsLife+★ 4.7 · 3,700 reviewsWhy does a sleep mask slip when you sleep on your side?
A sleep mask slips when you sleep on your side because the pillow drags it sideways and pushes it up the face each time you settle or turn, and most people change position many times a night, so small shifts add up long before morning.
A study that fitted 664 Danish working adults with accelerometers and recorded their sleep at home found they spent 54.1% of their time in bed on their side and changed position on average 1.6 times an hour (Skarpsno and colleagues, Nature and Science of Sleep). Over an eight-hour night, that works out at roughly a dozen turns.
Every turn is another chance for the mask to ride up. One side sleeper found it pushed up so far that “the cheek pads rest on my lower eyelids”. Tightening the strap helps a little, but a strap pulled hard enough to resist the pillow is usually too tight to be comfortable.
Two habits do more, and both are specific to side sleeping. Wear the strap above the ears, where it grips the back of the head instead of sliding towards the neck, and pick a mask that is barely thicker at the sides than in the middle, so the pillow has less to catch. Our guide on how to wear a sleep mask so it stays on walks through the rest of the fitting routine, from settling the mask to tying back long hair.
Slim profile or eye cups: which shape suits side sleeping?
For side sleeping, a slim flat mask usually copes better with the pillow because it flexes and compresses with your face, while a cupped or contoured mask keeps fabric off the eyelids and lashes but can be pushed off-centre when the pillow presses on its deeper side.
Neither shape is wrong for everyone. A flat mask rests lightly on closed lids, which some people never notice and others can’t stand. A cup mask avoids that contact, but its raised rim has to sit evenly around each eye, and one tester found the ridges “can get offset” once their face was on the pillow.
The deeper and stiffer the cup, the more the pillow has to push against. If contact on your lids or lashes keeps you awake, a shallow cup in soft, compressible foam is the side-sleeping compromise. If you mainly want a mask that stays dark against a firm pillow, thinner is usually better, and our comparison of contoured vs flat sleep masks sets out the trade-offs of each shape in full.
Where should the strap sit when you sleep on your side?
On your side, the strap should sit above the ears and lie flat around the back of the head, with no buckle or thick edge at the temple, because whatever sits between your head and the pillow gets pressed into you for hours.
People who test masks as side sleepers keep coming back to the same point, that thinner masks and thinner straps matter most for comfort. A wide strap with a hard edge can “dig into my ear”, and a plastic buckle on the pillow side is a small, hard object you lie on all night. A strap that loosens causes the opposite trouble, because a band that has relaxed lets the pillow shift the mask further with every turn.
For side sleepers who want a strap that keeps its grip through a night of turning, we made our Deep Sleep Mask with an adjustable Velcro strap, which holds its tension and won’t degrade or pull hair as you roll from one side to the other. Close it fully before you lie down so it stays flat against the back of your head.
How do you keep the pillow side of the mask dark?
To keep the pillow side dark, the mask has to stay in contact with your face at the nose bridge and upper cheek while that side is compressed, because that is where a gap opens when the pillow pushes the cheek up and tilts the mask away from the nose.
Stiff, heavily structured masks are the usual offenders, since they hold their own shape instead of following yours. One side sleeper said their mask “lets way too much light through around the nose area”. A soft mask that bends with the face keeps that edge closed far more reliably than a rigid one.
A thin line of light still matters with your eyes shut. A closed eyelid lets some light through rather than stopping it altogether (Bierman, Figueiro and Rea, Journal of Biomedical Optics), and room light during the usual hours of sleep suppresses melatonin (Gooley and colleagues, Journal of Clinical Endocrinology and Metabolism). Darkness supports the body’s natural melatonin release, which is why the seal matters as much as the fabric.
Fabric still counts on this side, because your cheek is pressed against the mask for hours. Our Deep Sleep Mask is made from natural mulberry silk with no cotton, which reduces friction on the skin around the eyes, and it is designed for total darkness. It is also washable at 30 °C, which helps with something that spends every night pressed into a pillow.
Can you wear earplugs and a sleep mask together on your side?
Yes, side sleepers can wear earplugs and a sleep mask together comfortably if the earplugs go in first and the mask strap runs above the ears, so the strap never sits over the earplug on the pillow side. Earplug shape is a subject of its own, and our guide to earplugs for side sleepers explains which designs stay comfortable with your ear against the pillow. Our Life+ earplugs have an ultra-low-profile flush fit designed so the earplug does not press against the pillow, and they are made from hypoallergenic silicone and reusable. For the full bedtime routine, read our guide to using a sleep mask and earplugs together, or get both at once in the Deep Sleep Duo, which pairs the mask with Life+.
Which mask set-up suits which kind of side sleeper?
The right mask set-up depends on how you sleep on your side, because a firm pillow, a face turned partly into the pillow and a habit of switching sides each cause a different failure, and each one points to a different feature worth looking for.
| Side-sleeping situation | What usually goes wrong | What to look for |
|---|---|---|
| Firm or high pillow | Thick sides press into the temple and the mask is pushed up | A thin, flexible mask with little bulk at the sides |
| Face turned partly into the pillow | Light leaks at the nose bridge and cup rims shift | A soft mask that bends at the nose and keeps contact when pressed |
| Switches sides through the night | The mask rides up a little with every turn | A strap that holds its tension, worn above the ears |
| Long hair | The strap slides or catches loose strands | A strap that won’t pull hair, with hair tied low below it |
| Dislikes contact on the lids or lashes | A flat mask rests on closed lids | A shallow, soft cup, checked to sit evenly when you lie on your side |
| Also woken by noise | The strap sits over the earplugs or bulky earplugs meet the pillow | Low-profile earplugs put in first, strap above the ears |
| Warm sleeper | The cheek, mask and pillow trap warmth together | A breathable natural fibre (silk and cotton both breathe) that washes easily |
If you recognise yourself in more than one row, start with the strap and the pillow-side seal. Get those two right and shape rarely becomes the problem.
So which sleep mask should a side sleeper choose?
Start with a mask that is thin at the sides and soft enough to bend with your face at the nose. Fasten it with a flat strap above the ears, then pick the shape by one question: does contact on your lids bother you? For every other criterion, from fabric to fastenings, our guide on how to choose a sleep mask compares the options side by side.
If darkness and a strap that keeps its grip matter most to you, our Deep Sleep Mask is natural mulberry silk, designed for total darkness and washable at 30 °C, for £39.95 with free UK delivery over £35. The 40-day money-back guarantee lets you try it on your own pillow, on whichever side you sleep.
His connection to hearing protection stems from personal experience with sound sensitivity during live events and work in noisy environments, an issue that made him more aware of the long-term risks of unmanaged noise exposure. Today, as both a communicator and a user of BOLLSEN products, he is passionate about raising awareness around the importance of proactive hearing care.
At BOLLSEN, he develops data-driven marketing campaigns, writes SEO-focused articles, and manages communication channels that connect customers with practical knowledge about hearing protection. His work ensures that BOLLSEN’s message—prioritizing health, performance, and sustainability reaches a global audience in an engaging and trustworthy way.
Passionate about writing since childhood, Timotej combines creativity with a strong analytical approach, continuously testing new ideas in digital marketing, performance advertising, and social media. He believes in learning through innovation and collaboration, balancing leadership with openness to new perspectives.
Beyond his professional role, Timotej is committed to a healthy lifestyle and finds inspiration in fitness, sports, and quality time with friends. His personal passion for well-being aligns with BOLLSEN’s core values, making his work not only a career but also a cause he deeply believes in.
