Darkness, done properly
How to Choose a Sleep Mask That You'll Actually Keep On
Most people give up on sleep masks for the same two reasons: light sneaks in beside the nose, or the thing ends up on the floor by 2am. Both are fit problems, and both are avoidable if you know what to check.
Why darkness is worth the effort
Light is the main signal your body clock uses to decide when it's day. Morning light is genuinely useful — it helps you feel awake and keeps your schedule anchored. But light arriving before you meant to get up does the same job at the wrong time, which is why summer mornings, streetlights and night-shift sleep are so disruptive. A mask lets you keep the darkness on your schedule rather than the sun's.
The four things that decide if it works
The nose seal
Almost all light leaks here. A contoured nose area or adjustable wire is the single biggest quality difference.
Eye clearance
Contoured cups keep fabric off your eyelids so you can blink freely — far easier to tolerate all night.
Strap and buckle
Wide, flat and adjustable. Avoid bulky clips if you sleep on your side or use a firm pillow.
Breathability
A mask that traps heat gets pushed off in the night. Soft cotton or silk beats thick synthetic padding.
Match the mask to how you sleep
- Side sleeper: low-profile strap, no rear buckle at the back of the head, deeper eye cups.
- Night shift or bright bedroom: prioritise the nose seal above everything — this is where blackout masks earn their price.
- Light sleeper who also hears noise: pair a mask with a sound machine; darkness alone won't stop a slamming door.
- Traveller: flat or foldable, washable, and light enough to forget you packed it.
- Lashes or makeup: contoured only — flat masks press directly on the lashes.
Care, so it lasts
Masks sit on your face for eight hours a night, so wash yours regularly — cotton usually handles a gentle machine wash, silk prefers hand washing and air drying. Check that a contoured mask's cover is removable before buying; the ones that can't be washed rarely last a year.
Common questions
Do sleep masks really work?
For blocking light, yes — a mask that seals well removes the light that a thin curtain or a bright streetlamp lets through. Light is one of the strongest signals your body clock reads, and a bright bedroom in the early morning can end your sleep earlier than you intended. The catch is fit: a mask that leaks around the nose or slides off does very little.
Contoured or flat?
Contoured masks have moulded eye cups so nothing presses on your eyelids, which means you can blink and move your eyes freely — usually more comfortable, and better for anyone who wears eye makeup or finds pressure irritating. Flat masks are thinner, pack smaller and often feel softer, but they rest directly on the eyes. If you're unsure, contoured is the safer first purchase.
Silk or cotton?
Silk feels cool and slides against the skin, which some people prefer on the face; cotton breathes well and is easy to wash. Neither blocks more light on its own — blackout performance comes from the shape, the seal around the nose and any internal blackout layer, not the outer fabric.
Why does light leak in around my nose?
It's the hardest part of the face to seal, and most cheap masks ignore it. Look for a contoured nose area, an adjustable nose wire, or a flap designed to close that gap. This single detail is the difference between a dim mask and a genuinely dark one.
Are sleep masks okay for side sleepers?
Yes, but strap design matters more. A wide, flat strap or a slim buckle sits better against a pillow than a thick plastic clip or a knot at the back of the head. Deeper eye cups also help, because nothing presses inward when your face is against the pillow.
Where to go next
Our shortlist highlights contoured and flat masks, with the fit details that matter called out for each one. If light isn't your only problem, the white noise guide covers the other half — and the homepage alarm is free to use tonight.