If you want the darkest possible sleep for the least money and effort, a good sleep mask wins: it blocks light from every direction, costs a few pounds and travels with you. If you want a dark room, one that stays cool in summer, quieter, and dark for a partner as well, blackout curtains or a blind are the better investment.
The choice between a sleep mask and blackout curtains is not really about which blocks more light. It is about where the light is coming from, who else is in the room, whether you can change the window, and whether you are happy with something on your face all night. This guide sets the two side by side and then says plainly which suits which situation.
Why darkness is worth the effort
Light through closed eyelids still reaches the light-sensitive cells that set your body clock. In the evening it delays melatonin; in the early hours, when sleep is naturally lighter, it makes waking more likely. Street lights and the summer dawn, which in the UK arrives before 5am in June, are the usual culprits. The fuller explanation is in how to make your bedroom darker; this article assumes you already know you want it dark and are deciding how.
Sleep mask vs blackout curtains at a glance
| Sleep mask | Blackout curtains or blind | |
|---|---|---|
| Light blocked | Almost all, from any direction, if it fits well | Most window light; edges and top usually leak unless fitted carefully |
| Light from inside the room | Blocked (partner's lamp, TV, LEDs) | Not blocked |
| Typical cost | A few pounds to around £30 | £30 to £150+ per window, plus pole or fittings |
| Comfort | Some people never get used to it; contoured masks help | No effect on comfort |
| Side sleepers | Can shift or press; contoured or thin silk masks are better | No issue |
| Renters | Ideal, nothing to fit | Curtains need a pole; no-drill blinds avoid holes |
| Travel and hotels | Ideal | Not portable, though stick-on blackout sheets exist |
| Partner on a different schedule | Ideal: you are dark, they can read | Room is dark for both; does not help if they need a light on |
| Waking naturally with the morning light | Not possible while wearing it | Not possible with the blind down, unless you open it |
| Summer heat and outside noise | No effect | Thermal linings reduce both a little |
| Hygiene and upkeep | Needs washing; elastic wears out in a year or two | Occasional wash; lasts years |
When a sleep mask is the better choice
The light is not coming from the window. A partner who reads, a TV, a landing light for children, a phone charging. Curtains do nothing about any of these.
You cannot change the window. Rented flat, a landlord who will not allow fittings, a skylight, a glazed door, a bay window that would cost a fortune to cover.
You sleep in the daytime. Shift workers need near-total darkness at 11am, and even good curtains leak at the edges in full sun. A mask over the top of whatever the window has is the reliable option.
You travel or sleep away often. Hotel curtains are unpredictable. A mask in your bag is not.
You want to try darkness cheaply first. A mask is the fastest way to find out whether a darker night actually improves your sleep, before spending on the room. Our sleep mask buying guide covers fit, materials and the difference between flat and contoured designs.
The drawback is comfort. Some people take a week to stop noticing a mask; a few never do. Masks that press on the eyes, slip off, or make you hot are the usual complaints, and each has a design answer: contoured masks with eye cups, masks with a wide adjustable strap, and thin silk or breathable fabric respectively. The question of whether a sleep mask actually helps you sleep is covered separately.
When blackout curtains are the better choice
The window is the problem and you can fix it. A street light outside, a security light, a neighbour's kitchen. If the light comes through the window and you own or can fit to the window, cover it.
Two people, one room, same schedule. Curtains darken the room for both of you. Persuading a partner to wear a mask every night is a harder sell.
You want to wake with the light. This sounds contradictory, but with curtains you can choose: closed for the summer dawn, half open in winter so the morning light helps you wake. A mask is all or nothing until you take it off.
Summer heat and noise. Thermal blackout curtains keep a bedroom cooler in a heatwave by stopping sun through the glass, and thick lined curtains take the edge off traffic noise. Neither effect is large, but both are real, and a mask offers neither.
Children's rooms. Small children cannot wear masks. A blind or curtains are the only option, and no-drill blinds work for travel cots and holiday lets.
The drawback is that curtains alone rarely make a room fully dark. Light leaks over the top, down the sides and through the gap where they meet. Fitting a pole that extends well beyond the frame, choosing wide curtains, and adding a blind behind them all help, and the blackout curtains buying guide goes through the fitting details that make the difference.
The 'both' answer
For a lot of people, the honest answer is both: curtains or a blind to get the room most of the way there, and a mask in the bedside drawer for summer mornings, a partner reading late, or the nights when you need to be certain. This is not an expensive combination. A decent no-drill blind and a contoured mask together cost less than one pair of made-to-measure curtains.
If you have to pick one, use this rule: if the light comes from the window and you can change the window, curtains or a blind. If it comes from anywhere else, or you cannot change the window, a mask.
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| Product type | Best for | Key feature | Worth knowing | Where to find it |
|---|---|---|---|---|
| Contoured (3D) sleep maske.g. Manta Sleep Mask | Side sleepers and anyone who dislikes pressure on the eyes | Moulded eye cups that sit around, not on, the eyes | Bulkier than a flat mask, so less convenient for travel. | Check current availability on Amazon |
| Thermal blackout curtains (eyelet)e.g. Various UK retailers' own brands | Bedrooms with street lights or early summer dawn | Multi-layer or coated fabric marketed to block most light and reduce heat loss | Light still leaks around the edges and top unless the curtains overlap the frame generously; measure carefully. | Check current availability on Amazon |
| No-drill blackout blinde.g. Various (temporary or suction-fit blinds) | Renters, travel cots, and windows where curtains leave gaps | Fits inside the window recess without drilling | Suction fittings may need re-fixing; less tidy-looking than fitted blinds. | Check current availability on Amazon |
Where to go next
Try the cheap option first. A mask for a week tells you whether darkness is your problem. If it is, and the window is the source, invest in the window.
If you are waking early in summer regardless, the guide to waking up too early covers the other reasons it happens, and the rest of the Sleep Environment guides cover temperature and noise, which are usually the next things to check.
Frequently asked questions
Can a sleep mask really block as much light as blackout curtains?
At the eyes, yes, and often more. A well-fitting contoured mask blocks close to all light, including light from inside the room. Curtains only block the window, and rarely all of it. The mask only fails if it does not fit around the nose or slips off during the night.
Are blackout curtains worth it if I already have a sleep mask?
They are if you want the room itself dark, for example so you can wake naturally without a mask, or if you share the room with someone who will not wear one. They also reduce summer heat and outside noise a little, which a mask does not.
Do blackout blinds or curtains work better?
A blind fitted close to the glass stops more light entering the room, but leaves gaps at the sides in a recess. Curtains cover a wider area but leak at the top and edges. The darkest result is a blind behind curtains. If you can only have one, a blind fitted outside the recess is usually the darker option.
Sources and further reading
- NHS Every Mind Matters: How to fall asleep faster and sleep better
- Sleep Foundation: Sleep Foundation
- The Sleep Charity: The Sleep Charity
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Written and reviewed by the Quiet Mind Sleep editorial team in line with our editorial policy. Spotted an error? Let us know.
