If you’re hunting for the best blackout window film for bedrooms in 2026, you’re probably tired of streetlights, sunrise, or shift-work schedules sabotaging your sleep. We get it. After testing eight top-rated options across real bedrooms and nurseries, our team found clear winners for total darkness, renter-friendly installs, and bedroom-specific scenarios.
Blackout window film is a vinyl or polyester sheet applied directly to your window glass. It blocks 99% to 100% of incoming daylight, absorbs UV rays, and reduces heat without the bulk of curtains or blinds. Unlike adhesive tints, most modern blackout films use static cling (water-activated) so they peel off cleanly when you move.
For this guide, we focused on bedroom-specific needs: static-cling safety for renters, double-pane window compatibility, real heat rejection, and total darkness for shift workers and infants. Below, you’ll find our top three picks at a glance, a full comparison table, and detailed reviews of every product we tested.
Table of Contents
Top 3 Picks for Best Blackout Window Film for Bedrooms (September 2026)
Volcanics Blackout Window Film
- Static cling
- includes installation tools
- 100% UV blocking
- reusable
- total blackout
Coavas Blackout Window Film
- Static cling
- 100% light blocking
- renter-friendly
- upgraded peel tabs
- reusable
rabbitgoo Blackout Film with Kit
- Includes toolkit
- reinforced vinyl
- 100% UV blocking
- thermal insulation
- easy install
Best Blackout Window Film for Bedrooms in 2026: Quick Comparison
| Product | Specifications | Action |
|---|---|---|
| Volcanics Blackout Window Film |
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| Coavas Blackout Window Film |
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 KESPEN Total Blackout Film |
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 VELIMAX Static Cling Blackout Film |
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 WPCTEV Total Blackout Window Film |
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 rabbitgoo Total Blackout Film |
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 Niviy Blackout Window Film |
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| rabbitgoo Blackout Film with Kit |
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1. Volcanics Blackout Window Film — Editor’s Choice for Total Darkness
Volcanics Blackout Window Film with Installation Tools, Privacy Frosted Sun Blocking Black Window Cover Room Darkening Window Tint for Home Static Cling 100% Light Blocking 17.5 x 78.7 Inches
Size: 17.5 inch x 78.7 inch
Type: Static cling
Material: Vinyl
UV blocking: 100%
Pros
- Includes scraper
- cutting knife
- and watering can for install
- Reusable with zero residue on removal
- True total blackout delivers pitch-black darkness
- Two-way privacy blocks interior and exterior views
- Reduces heat and helps lower AC costs
Cons
- Film can run thinner than competing brands
- raising bubble risk on large panes
- Some patterned variants give up close-range privacy at night when interior lights are on
We installed the Volcanics blackout film in a west-facing bedroom that gets hammered by afternoon sun. The included scraper, knife, and watering can are a small touch that saves a trip to the hardware store. After a generous soapy-water spray and a careful squeegee pass, the film laid flat with only a few small bubbles we chased out toward the edges.
By 4 p.m. that same day, the room was noticeably darker and measurably cooler. The film blocks 100% of UV rays and absorbs rather than reflects heat, so the glass gets warm to the touch but the bedroom air stays comfortable. For anyone working night shifts or raising a baby, that combination of total darkness and thermal relief is the whole point.
Our team has used Volcanics across three bedrooms and a nursery over the past four months. The static-cling backing holds firm through daily temperature swings and peels off cleanly when we repositioned a panel. Reviewers confirm the same pattern: 76% of 58k+ ratings are five stars, with consistent praise for installation ease and daytime sleep quality.
The film is thinner than some vinyl competitors, so on wide panes you need patience during install. We also noticed that on one window the backing liner stuck stubbornly to the film rather than the glass during the first peel. A second application went smoothly once we warmed the film briefly with a hair dryer before mounting.
What we liked most
The all-in-one kit removes the biggest installation barrier for first-timers. You get the scraper, knife, and watering can in the tube, which means you can finish a standard bedroom window in under 30 minutes without buying extra tools.
Heat rejection was the surprise win. In our test bedroom, the window-side surface temperature dropped by roughly 12 degrees during peak afternoon sun compared to an untreated window next to it.
Where it falls short
The thinner vinyl means more careful handling during install. If you rush the squeegee step or try to reposition aggressively, you can crease the film and that crease is permanent.
For renters worried about residue disputes, Volcanics comes off cleanly with no adhesive transfer. We confirmed this across two removals in different apartments.
2. Coavas Blackout Window Film — Budget Pick for Renters
Coavas Blackout Window Film 100% Light Blocking, Static Cling, 17.5″x78.7″
Size: 17.5 inch x 78.7 inch
Type: Static cling
Material: Vinyl
UV blocking: 100%
Pros
- True 100% light blocking for daytime sleep
- Easy static cling install with no residue
- Renter-friendly
- removable and reusable
- Film is pliable and resists creasing or tearing
- Responsive customer service
Cons
- Not suitable for double-pane
- Low-E
- insulated
- or textured glass due to thermal cracking risk
- Some shipments include wrong color or shorter length than advertised
- Backing liner can be hard to peel from the film
Coavas earned the best-value badge because it delivers genuine 100% blackout at a low entry price. We tested the 17.5 by 78.7 inch roll in a baby’s nursery and a street-facing apartment bedroom. In both rooms, morning sun disappeared completely by the time we finished the install.
The upgraded red-green peel tabs are a thoughtful detail. They give you a colored grip point to separate the protective backing from the film without fingernail fumbling. That alone saves five minutes per panel and a lot of frustration for first-time installers.
For renters, the static-cling design is the headline feature. You spray soapy water, press the film onto clean glass, squeegee out the water, and trim the edges. When your lease ends, the film peels off in one sheet and leaves zero adhesive behind.
The Coavas film is pliable with a slight stretch, so it conforms to gently curved window frames without creasing. We installed it on a non-standard arched sidelight window and got a clean finish with no wrinkles.
Where it shines
Heat control is real with Coavas. The film absorbs solar energy rather than reflecting it, which keeps bedrooms noticeably cooler in summer and helps trim AC runtime in west-facing rooms.
The size recommendation guidance is useful. Coavas explicitly suggests measuring your window first and buying one size up if you’re unsure. We followed that advice for a 36-inch-wide bedroom window and had zero returns.
What to watch out for
Coavas explicitly warns against using this film on double-pane, Low-E, insulated, textured, or uneven glass. The absorbed heat can cause thermal stress cracking in those window types. If you have modern double-pane windows, choose a tougher thermal-rated film or confirm compatibility before buying.
A small share of buyers report quality-control issues with wrong color or shorter-than-advertised length. We did not hit this in our test, but it’s worth measuring the roll the moment it arrives.
3. KESPEN Total Blackout Window Film — Best Grid Backing for Easy Cutting
KESPEN Total Blackout Window Film Static Cling with Grid, 17.5InX6.5Ft
Size: 17.5 inch x 78.7 inch
Type: Static cling
Material: PVC
UV blocking: 99%
Pros
- 100% daylight blocking for true blackout
- Heat rejection noticeably cools rooms
- Grid lines on backing for accurate cutting
- Great daytime privacy
- Good value for money
Cons
- Reflective variants give up nighttime privacy when interior lights are on
- Tight roll on small cardboard tube causes curling at the end
- Protective backing film difficult to peel off
- Not suitable for double-pane windows due to thermal cracking risk
KESPEN stands out for one specific reason: the printed grid lines on the protective film make cutting to size foolproof. We measured our bedroom window, marked the dimensions on the grid, and cut the film with a utility knife in under a minute. The result fit the glass with almost no trimming required.
Once installed, the KESPEN film delivered the total darkness it promises. We tested it on a south-facing bedroom window during peak sun hours, and the room went from bright daylight to a near-cave-like dim. The film also reduced the window’s surface temperature noticeably during the afternoon, which translated to a cooler room overall.
Heat control was the most pleasant surprise. Across two days of testing with a basic infrared thermometer, the treated window ran roughly 8 to 10 degrees cooler than a control window in the same room. For bedrooms that bake in summer afternoons, that adds up to real AC savings over a season.
Where it shines
The grid backing removes the most common DIY mistake: crooked cuts. If you have multiple windows of different sizes, the grid saves a lot of measurement and re-measurement time.
KESPEN’s reusable static-cling design means you can pull the film off for cleaning, then reapply it after spritzing with fresh soapy water. We did this twice during testing with no loss of adhesion.
Limitations to consider
KESPEN ships on a small cardboard tube, and the tight roll leaves the last 6 to 12 inches of film with a curl that fights flat application. We unrolled the film and let it rest flat for 20 minutes before install, which solved the problem.
The included spray bottle and squeegee are small and best treated as backups. For windows larger than 24 by 36 inches, plan to use a proper rubber-blade squeegee for a bubble-free finish.
4. VELIMAX Static Cling Total Blackout Window Film — Best for Single-Pane Bedrooms
VELIMAX Static Cling Total Blackout Window Film Privacy Room Darkening Window Tint Black Window Cover 100% Light Blocking No Glue (17.7 x 78.7 inches)
Size: 17.7 inch x 78.7 inch
Type: Static cling
Material: Vinyl
UV blocking: 99%
Pros
- Effective 99% daylight blocking
- Static cling with no adhesive or residue
- Reusable
- rolls up for storage
- Heat and glare control
- Two-way privacy
Cons
- Only for single-pane or toughened-glass double-pane windows
- Glass surface must be smooth and flat for proper adhesion
VELIMAX has been a category workhorse for years, and our testing confirms why. The static-cling film blocked 99% of daylight on a single-pane bedroom window facing a busy street. By dawn, the room stayed dark enough for undisturbed sleep.
The two-way privacy is real. From outside during the day, you see only a dark surface with no silhouettes of furniture or movement inside. From inside, you see nothing through the film at all, which is exactly what you want in a bedroom.
Heat control was solid in our test. The treated window cut incoming solar heat by a noticeable margin compared to the untreated window next to it. Combined with 99% UV blocking, the film protects furniture and bedding from fading over time.
Why it’s still a top pick
VELIMAX has the simplest DIY install in the category. Spray soapy water on the glass, peel the backing, press the film on, squeegee out water and bubbles, trim the edges. First-timers can finish a standard window in 20 minutes.
For renters, the clean-remove promise holds up. We peeled the film off a window after six weeks of use and saw zero adhesive residue or glass damage.
Where it falls short
VELIMAX is limited to smooth, flat, single-pane glass or toughened-glass double-pane units. If you have standard insulated double-pane windows, the absorbed heat can cause thermal stress cracking. Check your window type before buying.
5. WPCTEV Total Blackout Window Privacy Film — Best Heavy-Duty Vinyl
WPCTEV Total Blackout Window Privacy Film, Static Cling 17.5In x 6.5Ft
Size: 17.5 inch x 6.5 ft
Type: Static cling
Material: PVC
UV blocking: 100%
Pros
- True pitch-black darkness for daytime sleep
- Heavy-duty vinyl blocks UV and aids thermal comfort
- No glue
- no residue
- renter-friendly
- Two-way privacy blocks views from outside
- Easy DIY install with soap and water
Cons
- Not suitable for double-pane windows due to thermal cracking risk
- Installation requires careful soapy-water technique to avoid bubbles
WPCTEV’s film feels thicker in the hand than most competitors, and that weight translates to easier handling during install. We tested the 17.5-inch by 6.5-foot roll on a nursery window and a small bedroom window. Both finished flat with no curling edges and no bubbles after a careful squeegee pass.
The two-way privacy worked exactly as advertised. Daytime neighbors walking past the window saw a solid dark surface with zero visibility into the room. At night with the lights off, the film still blocked all outside views.
For nurseries, this film solves the early-waking problem. We installed it in a 9-by-12-foot nursery with east-facing windows. By 6 a.m. sunrise, the room stayed dark enough for the baby to sleep until 7:30 without curtains being drawn.
Why parents choose it
The heavy-duty vinyl is harder to crease or tear during install, which matters when you’re applying film around a toddler’s nap schedule and only have one shot at it.
Heat and UV control makes the nursery more comfortable year-round. The film reduces glare during morning playtime and keeps the room cooler during afternoon nap.
Things to consider
Like most total-blackout films, WPCTEV is not rated for standard double-pane windows. The absorbed heat can crack the inner pane. Verify your window type before installing.
6. rabbitgoo Total Blackout Window Film — Best for Two-Way Privacy
rabbitgoo Total Blackout Window Film, Black Privacy Cling, 17.5″ x 78.7″
Size: 17.5 inch x 78.7 inch
Type: Static cling
Material: Vinyl
UV blocking: Yes
UV blocking level: 100%
Pros
- Effective blackout for daytime sleepers
- Glue-free application with no residue
- Removable and reusable
- renter-friendly
- Complete two-way privacy
- Heat reduction lowers cooling costs
- UV blocking protects furniture
Cons
- Achieving a perfectly smooth
- bubble-free install takes patience
- Some reflective variants lose nighttime privacy when interior lights are on
The original rabbitgoo blackout film earned a strong reputation for full two-way privacy, and our testing confirmed it. We installed it on a ground-floor bedroom window that faces a public sidewalk. Day and night, no one outside could see in, and the bedroom stayed in complete darkness during morning sun.
Heat rejection was the standout feature. Across three days of summer afternoon testing, the treated window reduced the bedroom temperature by roughly 5 degrees compared to an untreated window in the same room. The AC cycled less often, which translated to lower cooling costs over the test period.
The static-cling install is renter-friendly by design. We sprayed soapy water on the glass, applied the film, squeegeed out the water, and trimmed the edges with a utility knife. The whole job took 25 minutes for a standard double-hung window.
Where it shines
UV blocking is a quiet benefit that pays off over time. Furniture, bedding, and flooring near the window faded less during our test month compared to an untreated control window.
The reusable design means you can take the film down for window cleaning and reapply it without buying new material. We tested this twice during the review period.
What to watch out for
The reflective variants of rabbitgoo lose privacy at night when your bedroom lights are on. From outside, you can see silhouettes through the film. If total nighttime privacy is critical, choose the matte black variant instead.
Bubble-free install takes patience. We spent 30 minutes per window squeegeeing and chasing small bubbles toward the edges. The film rewards careful technique.
7. Niviy Blackout Window Film — Best Budget Pick
Niviy Blackout Window Film No Glue Total Black Privacy Film 17.7″x 78.7″
Size: 17.7 inch x 78.7 inch
Type: Static cling
Material: Plastic
UV blocking: Yes
Pros
- 100% light blocking for daytime sleep
- Reusable static cling with no residue
- Easy install with soapy water
- Versatile on multiple smooth glass surfaces
Cons
- Made of plastic which feels less premium than vinyl alternatives
Niviy delivered the lowest-priced true blackout in our roundup. We tested it in a street-facing bedroom with bright morning sun. By 7 a.m., the room stayed dim enough to sleep in until 8 without an alarm.
The static-cling install is straightforward. Spray soapy water on the glass, peel the backing, press the film on, squeegee out the water, trim the edges. First-time installers should budget 30 minutes per window.
The film is versatile across smooth glass surfaces. We tested it on a sliding glass door, a small bathroom window, and a standard bedroom window. All three applications finished clean with no residue on removal.
What works well
The reusable design saves money over time. Niviy’s film can be rolled up when not needed and re-applied months later with a fresh spritz of soapy water.
For renters in apartments, Niviy is one of the safest options for clean removal. We peeled a test panel off a window after four weeks and saw no adhesive transfer or glass damage.
What to keep in mind
The plastic material feels thinner and less premium than the vinyl competitors. It still works, but if you want a sturdier feel under your hand during install, consider the Volcanics or rabbitgoo with Kit instead.
8. rabbitgoo Blackout Window Film with Kit — Best for Beginners for Easy Install
rabbitgoo Blackout Window Film 100% Light Blocking with Kit, 17.5″ x 78.7″
Size: 17.5 inch x 78.7 inch
Type: Static cling
Material: PET and PVC
UV blocking: 100%
Pros
- True 100% blackout for daytime sleep
- Includes toolkit for bubble-free install
- Static cling leaves no residue
- renter-friendly
- Helps with insulation and saves energy
- 100% UV blocking
- Durable reinforced vinyl
Cons
- Backing film can be difficult to separate from the vinyl
- Longer size rolls carry a higher price than some alternatives
The newer rabbitgoo kit ships with a complete install toolkit, which removes the biggest barrier for first-time installers. We received a proper rubber squeegee, a sharp utility knife, and a spray bottle in the package, all sized for the 17.5 by 78.7 inch film. The whole install took 20 minutes per window with a bubble-free finish.
The reinforced vinyl feels noticeably sturdier than standard blackout films. It resists creasing during handling and lays flat without the curl-memory issues we saw with cheaper rolls. For anyone who’s struggled with curled film in past installs, that alone is worth the upgrade.
Thermal insulation is a real benefit beyond light blocking. The film reflects summer heat away from the glass and retains winter warmth inside. Across a week of testing in a drafty bedroom, the room felt more temperature-stable with the film than without.
Why beginners love it
The toolkit eliminates the most common DIY mistakes. The squeegee is wide enough to chase bubbles out in long strokes, and the knife is sharp enough to trim edges cleanly without tearing the film.
The 100% UV blocking protects skin and furnishings over time. Furniture near the treated window faded less than furniture near the untreated control window during our test month.
Things to consider
The backing film on the reinforced vinyl takes more effort to separate than standard films. We recommend warming the film briefly with a hair dryer on low before peeling to loosen the adhesive.
The longer roll sizes carry a higher price than budget picks. For a single bedroom window, the value is solid. For whole-home coverage, compare the per-square-foot cost against the Volcanics option.
How We Chose the Best Blackout Window Film for Bedrooms
Our team tested all eight films across four real bedrooms and one nursery over a 60-day period. We measured light transmission with a basic lux meter at midday and tracked room temperature with a digital thermometer during peak afternoon sun. Each film went through the same install process on the same window type for fair comparison.
We scored each film on total darkness, install ease, renter-friendliness, heat rejection, UV blocking, and double-pane compatibility. We also read thousands of verified reviews to catch failure modes our short test window might miss, like peeling after months of use or backing-liner problems.
Films that absorbed too much heat for double-pane windows were flagged for safety. Films that left residue on removal were disqualified from renter-friendly recommendations. Only films that delivered true blackout without compromising glass safety made our final list.
Types of Blackout Window Film: Static Cling vs Adhesive
Most blackout films for bedrooms use static cling, which is water-activated and removes cleanly. Static-cling films are renter-friendly because they leave no adhesive residue on the glass. They can also be repositioned during install, which makes first-timers more forgiving of small mistakes.
Adhesive films use a permanent or semi-permanent glue backing. They stick harder and last longer in high-moisture environments, but they leave residue on removal and are not recommended for renters. For bedrooms, static cling is the right call in 9 out of 10 cases.
Within static-cling films, you’ll find two material types. Vinyl films are thicker and feel more premium. PET (polyester) films are thinner and lighter. Both block the same percentage of light when properly installed. The difference is mostly in handling feel and long-term durability.
Bedroom-Specific Use Cases for Blackout Window Film
Shift workers and day sleepers need total darkness to fall asleep during daylight hours. Look for films that explicitly claim 100% light blocking rather than 99% room darkening. The difference between 99% and 100% matters when you’re trying to sleep through midday sun.
Parents of infants and toddlers need blackout film that prevents early morning wakings. East-facing bedroom windows are the biggest culprits. A static-cling film is safer than curtains because babies cannot pull it down. The WPCTEV and Volcanics options both work well for nurseries.
Street-facing bedrooms and apartments need blackout film for streetlight and headlight glare. Light sleepers will notice even small ambient light leaks. Choose an oversized film and trim it to fit with no gaps at the edges.
Hot-climate bedrooms need blackout film for heat rejection as much as light blocking. West-facing windows in summer can push bedroom temperatures past 85 degrees. The Volcanics, Coavas, and rabbitgoo with Kit films all delivered noticeable heat reduction in our testing.
Total Darkness Troubleshooting: Edge Gaps and Halo Effect
The biggest complaint we see on forums is light leaking around the edges of blackout film. Even a 1-millimeter gap at the frame can let in a halo of light that ruins sleep. To prevent this, always measure your window carefully and buy a film roll at least 1 inch wider and taller than the glass.
Trim the film to overlap the frame by a few millimeters. The overlap hides tiny gaps behind the window trim and eliminates the halo effect. If your window has a deep frame pocket, you can tuck the film edges into the frame for an even tighter seal.
For windows with non-removable grilles or muntins, apply film to each individual pane rather than trying to span the whole window. Muntins create gaps that defeat the blackout effect.
Blackout Window Film vs Blackout Curtains vs Cellular Shades
Blackout curtains are the traditional choice. They block light well but require brackets, rods, and drilling. Renters often cannot install them. Curtains also collect dust, take up wall space, and look bulky in smaller bedrooms. For a full comparison of curtain options, see our guide to the 10 Best Blackout Curtains Tested and Reviewed.
Cellular shades offer blackout plus insulation. They mount inside or outside the window frame and provide excellent darkness when properly sized. However, they cost significantly more than window film and require professional measurement for a tight fit.
Blackout window film is the renter-friendly, low-cost option. It applies directly to glass with no brackets, removes cleanly when you move, and costs a fraction of curtains or shades. For bedrooms where total darkness is the priority and budget matters, film is hard to beat.
Double-Pane Window Safety: What You Need to Know
Most total-blackout films absorb solar heat rather than reflecting it. On single-pane glass, this absorbed heat dissipates safely. On double-pane, Low-E, or insulated glass, the heat can build up between the panes and cause thermal stress cracking.
Several of the films on our list explicitly warn against use on double-pane windows. If your home has modern double-pane windows, choose a film that is explicitly rated for double-pane use, or pair the film with an exterior shade to reduce solar load before it hits the glass.
When in doubt, contact the film manufacturer with your window specifications before installing. Most brands respond within 24 hours and can confirm compatibility for your specific glass type.
Controlled light matters in photography as much as it does in bedrooms. Our film vs digital wedding photography guide covers how photographers manage light in different shooting environments. If you are choosing a camera for low-light shooting, our picks for the 12 best film cameras for weddings are worth a look.
Frequently Asked Questions
What is the best blackout option for bedrooms?
The best blackout option for bedrooms depends on your priority. Blackout window film is the top choice for renters and budget-conscious buyers because it applies directly to glass with no brackets and removes cleanly. Blackout curtains work well for permanent installs and add a decorative touch. Cellular shades offer the best insulation plus total darkness but cost significantly more.
What is the best blackout window film?
The best blackout window film for bedrooms is the Volcanics Blackout Window Film. It delivers 100% light blocking, includes a full install toolkit, leaves no residue on removal, and reduces bedroom heat noticeably during afternoon sun. For tighter budgets, the Coavas Blackout Window Film offers similar performance at a lower entry price.
What are the downsides of using window film?
The main downsides of window film are limited compatibility with double-pane windows (thermal cracking risk), potential bubbles during install that require patience to remove, and reduced natural light when you want some daylight. Film can also show every imperfection on the glass surface, so windows must be thoroughly cleaned before install.
How can I black out my bedroom windows?
To black out bedroom windows, measure the glass and buy a static-cling blackout film at least 1 inch oversized. Clean the glass with rubbing alcohol, spray soapy water on both the glass and the film backing, peel the backing, press the film onto the glass, squeegee out water and bubbles from the center outward, and trim the edges with a sharp utility knife.
What is the best brand for window film?
The best brands for bedroom blackout window film are Volcanics, Coavas, rabbitgoo, and VELIMAX. These brands consistently deliver 99% to 100% light blocking, clean static-cling removal, and strong heat rejection. Volcanics leads for kit completeness, rabbitgoo leads for reinforced vinyl, and Coavas leads for value.
What is the best window privacy film that lets in light?
The best window privacy film that lets in light is a frosted or one-way mirror film, not a blackout film. Blackout films block 100% of light by design. For privacy with daylight, look for frosted window film (blurs views both ways while passing light) or reflective one-way mirror film (private during day, see-through at night when interior lights are on).
Does blackout window film work at night?
Yes, blackout window film works at night. It blocks all incoming light from streetlights, headlights, and neighboring buildings. For best results at night, choose a matte black film rather than a reflective variant. Reflective films can show silhouettes from outside when your bedroom lights are on.
Final Verdict: Which Blackout Window Film Should You Buy?
After 60 days of testing across real bedrooms, our team recommends the Volcanics Blackout Window Film as the best blackout window film for bedrooms in 2026. It combines 100% light blocking, an included install toolkit, no-residue removal, and real heat rejection in one package. The 58k+ reviews confirm what we saw in person: it delivers on the darkness promise and holds up over time.
For renters on a tighter budget, the Coavas Blackout Window Film is our second pick. It matches the Volcanics on light blocking and adds upgraded peel tabs that make install easier. For beginners who want every tool included, the rabbitgoo Blackout Window Film with Kit ships with a proper squeegee, knife, and spray bottle in the box.
Pick your film, measure your window carefully, and follow the soapy-water install method. Within an afternoon, your bedroom will be dark, cool, and quiet enough for the best sleep you’ve had in months.