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Sleep Number ComfortNext Lux Mattress Review: Test Lab Ratings
Sleep Foundation
Why Trust Us
Our mission to create a healthier, more well-rested world demands that our product reviews be best-in-class. You won’t find more expertise on mattresses and sleep products anywhere else.
The Sleep Foundation product testing team uses an industry-leading evaluation process paired with real world consumer feedback to come up with objective recommendations so that you can feel confident in your product decisions.
The ComfortNext Lux reinvents Sleep Number’s classic adjustable design with a contouring foam comfort layer and responsive microcoils. This combination delivers motion isolation and pressure relief while allowing you to easily adjust the firmness of the mattress.
- Real-time firmness adjustments
- Excellent pressure relief with deep contouring
- Above-average motion isolation for couples
- Luxury price-point
- Not enough support for many back and stomach sleepers
Sleep Number beds are beloved for their adjustable designs, which are made possible by adjustable air chambers inside the mattress. You can simply add or remove air from the chambers to change the firmness in different areas of the mattress.
The ComfortNext Lux is a 13-inch model that adds thick comfort layers above the air chambers. These layers are designed to provide extra comfort, pressure relief, and motion isolation while still allowing sleepers to modify the firmness level in real time.
Our testing team analyzed the ComfortNext Lux in our dedicated sleep lab. We go over our findings, including performance ratings, and explain which sleepers are the best match for this mattress.
SMART MATCHING
Is the Sleep Number ComfortNext Lux Right for You?
Use the filters below to see how well the Sleep Number ComfortNext Lux lines up with your unique needs. We'll also give you a couple other recommendations based on your answers.
TEST LAB RATINGS
How the Sleep Number ComfortNext Lux Scored
Motion Isolation8.5/10
Our testers found that motion isolation was one of the strengths of the ComfortNext Lux. The thick top layer of conforming polyfoam kept vibrations from rippling across the mattress surface. That allowed our testers to sleep without disturbance when their partner was getting in or out of bed or moving around at night.
Strong motion isolation makes the ComfortNext Lux a good fit for couples, especially since the mattress also allows each person to set the firmness level for their side of the mattress.
Jeremy Klein, Product Testing Manager: The ComfortNext Lux really impressed me with its motion isolation. Even with a higher firmness setting, the foam still absorbed almost all movement on the other side of the bed.
Pressure Relief9.5/10
The ComfortNext Lux earned a standout rating for pressure relief in our test lab. Our team loved how the foam gently enveloped sharp pressure points, especially the hips and shoulders of side sleepers.
Most of our testers also appreciated being able to modify the firmness level, which helped them find the right balance of comfort, support, and pressure relief. However, some back and stomach sleepers felt that there was too much conforming, which made the mattress less aligned with their sleep needs.
Mary Fenton, Head of Product Content: There’s no doubting how well the ComfortNext Lux relieves pressure. It was like a welcoming hug as the foam layer conformed to my body. I can see why this mattress wins over people with achy joints.
Temperature Control8.0/10
Because of how it conforms to the body, the foam in the ComfortNext Lux can make it harder for air to flow over the skin at night. This may result in some heat getting trapped, but most of our testers found the mattress maintained a reasonably cool temperature.
Sleep Number designed the ComfortNext Lux with cooling features intended to promote airflow through the foam and microcoils. The air chambers themselves also resist heat buildup.
Our results suggest that most sleepers will stay at a comfortable temperature on the ComfortNext Lux, but hot sleepers may prefer a mattress with less contouring.
Brad Nehring, Product Testing Manager: For me, the ComfortNext Lux was pretty middle of the road in terms of temperature. There was some heat retention, but it wasn’t stifling, nor did it really affect my sleep.
Edge Support7.0/10
Edge support was the weakest aspect of the ComfortNext Lux’s performance during our tests. The 3.5-inch foam layer compresses significantly around the perimeter, and the underlying materials provide little reinforcement.
Our testers didn’t find themselves rolling out of bed, but they did say they could feel more sinkage when sitting or lying close to the perimeter. While this may not be a concern for many sleepers, it can be an issue for those with a higher body weight or physical mobility limitations.
Jeremy Klein, Product Testing Manager: I didn’t love the experience of sitting on the edge of the ComfortNext Lux to put on my shoes. The edge is clearly the weakest point and feels decidedly less robust than the rest of the mattress surface.
Ease of Movement7.5/10
The downside of the ComfortNext Lux having an adaptive foam top layer is that it can be challenging to move on the mattress surface. This effect is amplified if you decrease the firmness level to make the mattress softer.
To give the mattress a bit of bounce, Sleep Number included 1.5 inches of microcoils within the second foam layer. However, our testing found that the thicker top layer blunted much of the springiness of the microcoils.
Mary Fenton, Head of Product Content: As a combination sleeper, I am constantly changing my sleeping position during the night. When I went to switch, I didn’t feel trapped, but I did feel like I was fighting the foam a bit.
Durability7.0/10
The ComfortNext Lux includes an impressive mix of materials. Along with adjustable air chambers, the mattress includes high-quality foams and well-designed microcoils.
Given these materials, we expect this mattress to have a long lifespan. However, compared to beds without air chambers or pumps, the ComfortNext Lux has more parts that can break down and fail. While you can typically fix any problems with replacement parts, these repairs may add to the long-term maintenance cost of the mattress.
HANDS-ON TESTING
Testing Team Takeaways
To test the Sleep Number ComfortNext Lux, we had three people on our testing team each take the bed home with them for one week. Here are their initial observations.
Brad Nehring
Product Testing Manager · Side sleeper · 215 lbs.
Side sleeper · 215 lbs.
“Compared to other Sleep Number mattresses we’ve tested, the ComfortNext Lux conforms more closely to the body. That was a big plus for me since it meant more cushioning around my shoulders and hips.”
Mary Fenton
Head of Product Content · Combo sleeper · 150 lbs.
Combo sleeper · 150 lbs.
“Like Brad, I could definitely feel the effect of the foam comfort layer. The contouring was great when I was on my side, but it was a little much when lying on my back or stomach.”
Jeremy Klein
Product Testing Manager · Side sleeper · 165 lbs.
Side sleeper · 165 lbs.
“The Sleep Number concept is so well-known that it’s easy to overlook its benefits. But it’s refreshing to be able to change the firmness level so easily. With a few taps on my phone, I can dial in the firmness to what feels best on any given night.”
Who it Fits
Fit by Sleep Position and Body Weight
Sizes, dimensions and weights
Side Sleepers
During our tests, side sleepers of all body weights received sufficient support from the Sleep Number ComfortNext Lux. They could feel the foam layer cradle their hips and shoulders, cushioning these sharp pressure points and promoting healthy spinal alignment.
The strongest ratings came from side sleepers under 130 pounds, followed closely by those who weigh between 130 and 230 pounds. Some side sleepers over 230 pounds felt that there was too much contouring, even if they turned up the firmness level.
Back Sleepers
The ComfortNext Lux delivers solid support to back sleepers up to 230 pounds. Our tests show the mattress is particularly well suited to those under 130 pounds. Back sleepers generally get the most support from a firm sleeping surface, but they also need cushioning that accommodates the curvature of the lumbar spine.
Our testers said that the foam layer was effective at relieving pressure in the lower back, and they were able to dynamically adjust the firmness level to keep from sinking too deeply into the bed. However, back sleepers over 230 pounds found that sinkage into the foam was excessive even after increasing the firmness by adjusting the air chambers.
Stomach Sleepers
During our testing, stomach sleepers under 130 pounds said they received good support from the Sleep Number ComfortNext Lux Mattress. But those weighing 130 pounds or more gave the mattress considerably lower marks for support.
Stomach sleepers typically need a firm mattress so they can rest with their body in a flat plane. If their stomach pushes down into the mattress, it can pull the spine into a U-shape that leads to aches and pains.
Even though the ComfortNext Lux has an adjustable firmness level, stomach-sleeping testers who weigh at least 130 pounds said that the mattress felt too soft because of how much the top layer contours to the body.
Construction
Inside the Sleep Number ComfortNext Lux
Cover
Polyester
Comfort Layers
Memory foam, polyfoam (zoned) with microcoil inset
Support Core
Adjustable air chambers, polyfoam
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Buying It
Trial, Warranty, and Delivery
Availability
When buying online, Sleep Number only ships the ComfortNext Lux within the contiguous United States.
The mattress is also sold through Sleep Number’s network of brick-and-mortar stores throughout the country. Shoppers in Alaska or Hawaii may be able to find this mattress in retail stores in their area.
Shipping
The ComfortNext Lux comes with free doorstep delivery. After your order is processed, Sleep Number ships the mattress in a box that arrives at your doorstep.
Once the mattress arrives, you need to bring the box to your bedroom and set up the mattress according to Sleep Number’s instructions. This usually requires two people and takes between 30 and 60 minutes.
Additional Services
Sleep Number offers two different options for White Glove delivery. The Premium delivery service costs $250 and includes mattress setup. The Ultimate delivery service costs $350 and includes both setup and removal of your old mattress. These fees are non-refundable if you decide to return the mattress.
Sleep Trial
The Sleep Number ComfortNext Lux comes with a 100-night sleep trial. You are required to keep the mattress for 30 nights as a break-in period. If you decide you want to make a return, you can coordinate with Sleep Number for the mattress to be picked up from your home. A pickup fee of $250 to $350 (depending on your location) will be deducted from your refund.
If you purchase a Sleep Number mattress from a third-party retailer, it may have a different return policy.
Warranty
Sleep Number backs the ComfortNext Lux Mattress with a 15-year limited warranty. The warranty is broken up into two parts.
During the first year, the mattress has a full warranty. If there is a covered defect in materials or manufacturing, Sleep Number will repair or replace the mattress at no cost to you.
After the first year, warranty service has a prorated cost that is calculated based on how long you’ve had the mattress and present-day pricing. In the second year, you are responsible for 35% of the costs of repairing a defect. This amount goes up by 5% every year until reaching 85% in year 11.
Mary is a product-content marketer who applies a pedigree in journalism, human-centered design, and cultural trends to inform strategy. Prior to Sleep Doctor, Mary led editorial and creative at ESPN and Rad Power Bikes. She likes to build and grow things, and break and fix things, and only sometimes in that order.