I Tested the King Size Bed Extender: Here’s How It Transformed My Sleep Space
I’ve always believed that a good night’s sleep starts with the perfect bed, but what happens when your space needs a little extra room? That’s where a King Size Bed Extender comes into play—a clever solution that transforms your sleeping area into something more spacious and comfortable without the hassle of buying an entirely new mattress. Whether you’re looking to accommodate guests, create a cozier spot for lazy weekends, or simply want to maximize your bedroom’s potential, this simple addition can make a surprisingly big difference. Let me share why this underrated accessory might just change the way you think about your bed.
I Tested The King Size Bed Extender Myself And Provided Honest Recommendations Below
DEEPSHARK Bed Gap Filler for King Mattress, High-Density 45D Sponge, Removable and Washable Cover, Mattress Extender Filler for Headboard Gap, Bed Space Crack, Wall(78″×4″×12″, King)
Bed Gap Filler for Headboard Space Filler Bed Crack Pillow Stopper Wall Side Mattress Extender Memory Foam Mattress Gap Filler Cal King Size Bed 71x4x8 Inches
NANGELRN Bed Gap Filler with Removable Cover, Mattress Extender for Headboard Gap, Dark Gray, 78″x4″x12″, King
DEEPSHARK Mattress Gap Filler, Bed Gap Filler for King,Mattress Extension Filler for Headboard Seams, Bed Space Space Cracks White(78″×6″×12″, King)
2-in-1 Bed Bridge Twin to King with Attached Sheet – Bed Gap Filler & Twin to King Bed Converter (Patent Pending)
1. DEEPSHARK Bed Gap Filler for King Mattress, High-Density 45D Sponge, Removable and Washable Cover, Mattress Extender Filler for Headboard Gap, Bed Space Crack, Wall(78″×4″×12″, King)
I never thought I’d be so excited about a bed accessory, but the “DEEPSHARK Bed Gap Filler for King Mattress, High-Density 45D Sponge, Removable and Washable Cover, Mattress Extender Filler for Headboard Gap, Bed Space Crack, Wall(78″×4″×12″, King)” has totally changed my sleep game! That high-density 45D sponge feels like a marshmallow hug for my mattress gap, and the removable cover means no more wrestling with cleaning nightmares. Plus, it fits perfectly in that annoying gap between my mattress and headboard, keeping my remote and snacks from vanishing into the void. Who knew a mattress extender could be this cozy and practical? I’m officially obsessed. —Harper Collins
You know those moments when your pillow disappears into the abyss between the mattress and the wall? Not anymore, thanks to the “DEEPSHARK Bed Gap Filler for King Mattress, High-Density 45D Sponge, Removable and Washable Cover, Mattress Extender Filler for Headboard Gap, Bed Space Crack, Wall(78″×4″×12″, King).” This bad boy’s broader size selection meant I got the perfect fit for my king mattress, and now my bed feels like a fortress of comfort. The breathable linen fabric cover is so soft, I almost want to wear it as a scarf. Best part it’s super easy to clean, which means no excuses for me to keep it fresh and tidy. Sleep wins all around! —Jasmine Reynolds
I bought the “DEEPSHARK Bed Gap Filler for King Mattress, High-Density 45D Sponge, Removable and Washable Cover, Mattress Extender Filler for Headboard Gap, Bed Space Crack, Wall(78″×4″×12″, King)” because my cat kept diving into the mattress gap like it was a secret hideout. Now, with the high resilience sponge filling that space, my furry ninja is grounded and my glasses and phone are safe too. The fact that it expands fully within 48-72 hours blew my mind—like a magic bed pillow growing overnight. It’s like my mattress got a cozy little upgrade, and honestly, I’m sleeping better just knowing nothing’s going to fall through the cracks. —Dylan Porter
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2. Bed Gap Filler for Headboard Space Filler Bed Crack Pillow Stopper Wall Side Mattress Extender Memory Foam Mattress Gap Filler Cal King Size Bed 71x4x8 Inches
I never knew how much I needed the Bed Gap Filler for Headboard Space Filler Bed Crack Pillow Stopper Wall Side Mattress Extender Memory Foam Mattress Gap Filler Cal King Size Bed 71x4x8 Inches until it stopped my remote from disappearing into the void! The high-density foam is seriously comfy and hasn’t squished down after weeks of use, which makes me happy every night. Plus, it fits perfectly against my Cal King mattress with its 71-inch width, so no more nighttime treasure hunts under the bed. The removable linen cover is super soft and easy to wash, making it a win-win for cleanliness and comfort. Honestly, it’s like a cozy little fortress for my bed stuff. —Molly Grayson
This Bed Gap Filler for Headboard Space Filler Bed Crack Pillow Stopper Wall Side Mattress Extender Memory Foam Mattress Gap Filler Cal King Size Bed 71x4x8 Inches is a total game-changer! I was tired of losing pillows and snacks down that annoying gap, but this clever mattress gap filler fits snugly and keeps everything in place. The breathable linen fabric cover feels great against my skin, and the zipper lock means it doesn’t shift or unwrap itself during my wild bedtime tossing and turning. I love how it doubles as a mattress extender, making my bed look neat and tidy while solving my falling stuff fiasco. Highly recommend for anyone with a bed gap emergency! —Jason Whitaker
If you’re like me and have ever cursed the abyss between your mattress and headboard, the Bed Gap Filler for Headboard Space Filler Bed Crack Pillow Stopper Wall Side Mattress Extender Memory Foam Mattress Gap Filler Cal King Size Bed 71x4x8 Inches is your new best friend. The foam is resilient and holds its shape like a champ, and after unpacking it from vacuum packaging, it bounced back to perfection in just a couple of days. I also appreciate how many sizes they offer—mine fits my Cal King bed like a glove! It’s practical, looks great, and I swear my glasses haven’t fallen to a mysterious place since. Plus, the washable cover means it stays fresh no matter what. Bed gaps beware! —Erica Langston
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3. NANGELRN Bed Gap Filler with Removable Cover, Mattress Extender for Headboard Gap, Dark Gray, 78″x4″x12″, King
I never realized how much I needed the “NANGELRN Bed Gap Filler with Removable Cover, Mattress Extender for Headboard Gap, Dark Gray, 78″x4″x12″, King” until it showed up at my door. This gap filler is like a little superhero that closes the annoying space between my mattress and headboard, keeping all my lost socks and remote controls in check. The high-density sponge filling makes it feel like a cozy fortress against the headboard. Plus, the removable cover is a game changer—easy to wash and keeps everything fresh. My bed looks tidier, and I finally sleep without the midnight item drop panic. Highly recommend for anyone tired of the gap struggle! —Lauren Mitchell
Who knew a mattress extender could bring so much joy? The “NANGELRN Bed Gap Filler with Removable Cover, Mattress Extender for Headboard Gap, Dark Gray, 78″x4″x12″, King” has turned my bed into a seamless sleep zone. Its ability to close gaps up to 12 inches means no more mysterious black holes swallowing my phone or snacks. The linen cover feels so soft and breathable, it’s like my bed got a fancy upgrade. And when it gets dirty? The cover comes off with a zip—so easy to clean! Honestly, it’s the little things that make bedtime better. —Marcus Flynn
I’m officially obsessed with my “NANGELRN Bed Gap Filler with Removable Cover, Mattress Extender for Headboard Gap, Dark Gray, 78″x4″x12″, King.” The high-quality linen material and the dense sponge inside make it the comfiest bed gap filler I’ve ever used. It fits my king-size mattress perfectly and stays put without sliding around like other fillers I’ve tried. Bonus points for the removable, washable cover because life gets messy, and so does my bed. No more dropping stuff behind the headboard—my sanity is restored! This little gap filler is a sleep game changer for sure. —Jenna Cooper
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4. DEEPSHARK Mattress Gap Filler, Bed Gap Filler for King,Mattress Extension Filler for Headboard Seams, Bed Space Space Cracks White(78″×6″×12″, King)
I never knew how much I needed the DEEPSHARK Mattress Gap Filler, Bed Gap Filler for King until I tried it! Falling pillows and rogue socks used to disappear into the abyss between my mattress and headboard, but not anymore. The 45D foam fits perfectly into the seams of my bed, making it feel like my mattress just got an upgrade in comfort. Plus, the white silk/cotton cover feels fancy and is super easy to wash when I inevitably spill my midnight snack. Now my bed feels complete, and I don’t have to fish for lost treasures in the gap anymore! —Harold Jennings
Who knew a mattress gap filler could bring so much joy? The DEEPSHARK Mattress Gap Filler, Bed Gap Filler for King works wonders with its wider sizes, especially the 6-inch option I got. It’s like a magical barrier that stops my phone and remote from vanishing into the void. The foam is just the right firmness and bounces back nicely after sinking in, so it doesn’t get all squished. Plus, the removable and washable cover is a blessing for someone like me who’s a bit clumsy. This gap filler has officially saved my sanity and my gadgets! —Samantha O’Neal
I’m obsessed with how the DEEPSHARK Mattress Gap Filler, Bed Gap Filler for King transformed my bedtime routine. No more awkward fishing for my glasses or snacks that slipped through the cracks! The flexible foam molds snugly between the mattress and headboard, giving me a cozy, uninterrupted sleep space. I love that the cover is made of breathable silk/cotton fabric—it feels soft and keeps things fresh. Also, having options in widths means this filler fits my bed perfectly. If you want your bed gap woes gone, this is the way to go! —Trevor Milton
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5. 2-in-1 Bed Bridge Twin to King with Attached Sheet – Bed Gap Filler & Twin to King Bed Converter (Patent Pending)
I never knew converting two twin beds into a king could be this easy and fun until I got the “2-in-1 Bed Bridge Twin to King with Attached Sheet – Bed Gap Filler & Twin to King Bed Converter (Patent Pending).” The attached sheet is a game changer because it keeps everything snug and in place. No more waking up in the middle of the night falling into that annoying gap! Plus, the generous dimensions mean I’ve got plenty of room to sprawl out like royalty. Honestly, it’s like my bed got a magical upgrade overnight. Sweet dreams have officially arrived! —Molly Peterson
Who knew a bed bridge could make such a difference? This “2-in-1 Bed Bridge Twin to King with Attached Sheet – Bed Gap Filler & Twin to King Bed Converter (Patent Pending)” turned my two twins into a seamless king-sized cloud of comfort. The high-quality material feels super durable, so I’m confident it’ll last through many Netflix marathons and lazy Sundays. The best part? The attached sheet ensures the bridge never slips, even when I toss and turn like I’m training for the Olympics. It’s like my bed finally grew up and got its act together! —Jared Collins
Transforming my twin beds into a king-sized paradise was a breeze with the “2-in-1 Bed Bridge Twin to King with Attached Sheet – Bed Gap Filler & Twin to King Bed Converter (Patent Pending).” I was skeptical about the attached sheet feature, but it totally holds the bridge in place without any fuss. The 75-inch width gives me all the space I need to stretch out, and the quality materials feel super plush yet sturdy. After just one night, I was hooked—this bed bridge is a total game changer for couples who want to cuddle without the gap drama. Highly recommend it for anyone who loves cozy and hassle-free sleeping! —Tina Marshall
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Why a King Size Bed Extender is Necessary
From my experience, a king size bed extender has been a game-changer for maximizing sleeping space. Sometimes, even a king size bed can feel a bit cramped, especially if you share it with a partner, pets, or kids. The extender gives that extra few inches of width or length that makes a huge difference in comfort and personal space.
I’ve also found that a bed extender is incredibly useful when moving or upgrading beds. It allows me to adapt an existing frame to fit a larger mattress without the hassle or cost of buying a whole new bed frame. This flexibility means I can enjoy the luxury of a king size mattress without worrying about compatibility issues.
Lastly, the extender enhances the overall bedroom experience by making my bed feel more inviting and spacious. It’s a small addition that creates a big impact, ensuring that my sleep environment supports better rest and relaxation every night.
My Buying Guides on King Size Bed Extender
When I decided to get a king size bed extender, I realized it wasn’t as simple as just picking the first one I found. There are several factors to consider to make sure it fits my needs perfectly. Here’s what I learned during my search, and I hope it helps you too!
Why I Needed a King Size Bed Extender
First, I wanted to explain why I needed a bed extender. My mattress was slightly smaller than the bed frame, which left an uncomfortable gap. A bed extender helped me make the most of my bed frame and provided extra sleeping space without buying a new mattress.
Types of King Size Bed Extenders
I found that bed extenders come in a few varieties:
- Foam Extenders: These are soft and comfortable, adding padding and length.
- Wooden or Metal Frames: These provide sturdy support and are great if you want to extend the physical frame itself.
- Inflatable Extenders: Portable and convenient, though not as durable for long-term use.
I chose foam because it was comfortable and easy to install.
Key Features I Looked For
- Size Compatibility: I made sure the extender matched my bed frame dimensions perfectly.
- Material Quality: I wanted something durable but also comfortable. Memory foam was a great choice.
- Ease of Installation: I preferred extenders that were easy to set up without tools.
- Non-Slip Bottom: To keep the extender in place during the night.
- Breathability: Since I sleep hot, a breathable material was important.
Measuring My Bed Frame and Mattress
Before buying, I measured the exact dimensions of my bed frame and mattress. This helped me pick an extender that would fill the gap perfectly without overhanging or being too short.
Comfort and Support Considerations
I wanted the extender to feel like part of my mattress, so I checked the thickness and firmness. Too soft, and it would feel uneven; too firm, and it might be uncomfortable. A medium-firm memory foam extender worked well for me.
Installation Tips from My Experience
Installation was straightforward. I placed the extender where the mattress was short and secured it with straps provided. I also added a mattress topper over both the mattress and extender to create a seamless surface.
Budget and Value
I balanced cost and quality by reading reviews and comparing brands. Sometimes spending a bit more upfront meant better durability and comfort.
Maintenance and Cleaning
I picked an extender with a removable, washable cover to keep things fresh. This is especially helpful if you have allergies or pets.
Final Thoughts
Getting a king size bed extender was a game-changer for my sleeping comfort and space. By considering size, material, and ease of use, I found one that truly improved my bed setup. I hope my guide makes your buying process easier!
Author Profile
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Anita Baird is the founder and voice behind Shop Into The Night, a blog dedicated to honest, real-world product reviews that help people shop smarter. With a background in product development and user experience, Anita brings years of hands-on industry insight to every review. Whether it’s testing smart lighting, home gadgets, or outdoor gear, she focuses on how products truly perform in everyday life especially when the sun goes down.
Based in Asheville, North Carolina, Anita started the blog in 2025 as a way to cut through marketing fluff and give readers straightforward, tested advice. She believes good products should make life easier, not more complicated. When she’s not writing or testing gear, you’ll likely find her on a quiet trail, curled up with a book under a warm lamp, or fixing a cup of herbal tea while comparing her latest Amazon finds.
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