Sleep Number i8 Bed Review

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Sleep Number i8 Mattress Review comparison
We evaluate mattresses across 8 key categories, providing an overall rating for easy comparison. For more details on our review process, read about how we test by clicking the question mark below.


Pressure Relief
Motion Isolation
Edge Support
Ease of Movement

Our Verdict

The Sleep Number i8 is ideal for those seeking customizable comfort, offering an extensive lineup for various preferences, dual adjustability for couples, and sleep tracking for health enthusiasts. It’s especially suited for hot sleepers due to its cooling features. However, many sleepers (ourselves included) experienced issues with the “trench effect,” a phenomenon where the center of the mattress, lacking reinforced support, dips or sags when two people lie close together.


  • Adjustable Firmness
  • Sleep Tracking
  • Responsive Air Feature
  • Cooling Technology ideal for hot sleepers


  • Expensive
  • Single air chamber (per side) can cause trench effect and hammocking

Product Details

Vector image of a mattress, referencing mattress type

Adjustable Air Bed

Vector Image of a feather, referencing firmness


Vector image of a half moon, stars and zzz, referencing mattress sleep trial


Vector image of a shield with a tick, referencing warranty

15-Year Limited

Vector image of an open mattress box, referencing shipping

Premium (FREE)

Vector image of a price tag with dollar sign, referencing price


Sleep Number smart beds have created a buzz due to their unique customization and advanced technology, promising an extraordinary sleeping experience. But the question is, do they really deliver what they promise? In this comprehensive Sleep Number i8 review, we will cover everything from its performance in key areas, such as temperature regulation and motion isolation, to popular alternatives and address frequently asked questions. By the end of this review, you will have a clear idea of whether the Sleep Number i8 is worth investing your money in.

Sleep Number i8 Mattress Review (YouTube)

How Firm Is The Sleep Number i8 Mattress?

The Sleep Number 360 i8 smart bed is an adjustable air bed known for its customizability. Adjustable air beds use air chambers as their core support system, allowing users to adjust the firmness of the mattress with a remote or app. By increasing or decreasing the air pressure, the mattress can become firmer or softer according to personal preference. This technology enables a customizable sleep experience, catering to different comfort needs and reducing pressure points by providing targeted support where it’s needed most.

Characterized by a 6″ foam comfort layer, the i8 is one of the plushest options in Sleep Number’s smart bed range. Its plush feel, combined with adjustable firmness, makes it particularly suited for side and back sleepers, providing a balance of comfort and support tailored to these sleep positions.

What Does The Sleep Number i8 Mattress Feel Like?

As part of the Innovation Series, the i8 is designed to offer superior pressure relief and comfort compared to the Classic and Performance series.

Featuring dual adjustability, the i8 allows for individualized firmness settings on each side of the bed, using air chambers for precise support. This makes it ideal for couples with different sleeping preferences.

Additionally, Sleep Number beds feature Responsive Air Technology, which automatically adjusts the bed’s firmness in response to movement, ensuring optimal comfort and support throughout the night.

That said, we have found, after researching other mattresses, that adjustable air beds with more than one air chamber on either side, such as Air-Pedic, offered superior support and targeted stubborn pressure points more effectively.

Furthermore, when placing our weight upon the air chambers, we could feel the air dispersing towards our head and feet, causing sagging through the midsection. This was more apparent the softer our number setting. Ultimately, the single air chamber design found in the Sleep Number beds had a tendency to create a hammock effect. See our air bed comparison for more details.

Smart Bed Technology & Personal Insights with the Sleep Number i8

The Sleep Number i8 smart bed utilizes advanced technology to enhance sleep quality by providing a comprehensive sleep score. This is achieved through sensors embedded in the bed, which monitor vital signs such as heart rate and breathing patterns, as well as physical movements throughout the night. This data is then communicated to an app on your smartphone or tablet.

Although we did notice some inconsistencies in movement tracking—perhaps due to shifting across the bed—this technology primarily offers a valuable glimpse into sleep quality. This feedback can guide adjustments to your Sleep Number setting, aiming to improve your sleep.

Choosing Your Sleep Number Setting

When you get your new bed, finding your ideal Sleep Number setting becomes a priority. This setting is essentially the mattress’s firmness level, adjusted by controlling the amount of air in the chambers, ranging from 1 (very soft, minimal air) to 100 (very firm, maximum air).

Discovering the perfect setting is a personalized process that involves experimenting with different levels of firmness until you achieve the best combination of comfort and support for your body. This adjustment phase is crucial for maximizing the benefits of your Sleep Number bed, ensuring a tailored sleep experience.

Sleep Number i8 Reviews: Mattress Performance

Cooling Technology

The Sleep Number i8 incorporates temperature-regulating technology through its use of ceramic gel-infused foam. This innovative material is designed to draw excess heat away from the body, ensuring a breathable and cool sleep experience. Such a feature is particularly beneficial for those who tend to sleep hot, offering a significant improvement in nighttime comfort by maintaining a cooler sleep environment.

Motion Isolation

Motion Isolation is crucial for those who are easily disturbed by their partner’s movements at night. Our experience with the Sleep Number i8’s motion isolation was mixed. While it didn’t provide the best motion isolation we’ve ever seen, it wasn’t the worst either.

It’s designed to reduce the disturbance caused by a partner moving, but due to its single-air chamber and lack of reinforced foam support in the center, some movement can still be felt. This might lead to occasionally rolling towards each other during the night.

Sleep Number Mattress Purchase Details

Sleep Trial

Sleep Number mattresses, including the i8 model, come with a 100-night sleep trial. This trial allows you to fully experience the mattress in your own home, ensuring it meets your comfort and support needs. However, it’s important to note that Sleep Number requires a minimum 30-day adjustment period before a return can be initiated. This period is designed to allow your body to adapt to the new sleeping surface, ensuring you can make an informed decision about the mattress.


The Sleep Number 360 i8 smart bed is backed by a 15-year limited warranty, which covers defects in materials and workmanship during this time. However, it’s important to note that accessories such as the Sleep Number remote and the SleepIQ technology are not covered under this warranty. These items, crucial to the bed’s smart features, may require separate considerations regarding warranty or protection plans.

Shipping & Delivery

The Sleep Number i8 Smart Bed comes with an inclusive premium delivery and setup service. On selecting a delivery date and time that works for you, Sleep Number’s technicians will handle the delivery and assembly of your new mattress right in your bedroom. Additionally, Sleep Number offers a mattress disposal service for a nominal fee of $50, taking care of your old mattress removal during the delivery of your new one.

How Much Does the Sleep Number 360 i8 Cost?

Sleep Number beds are among the most advanced mattresses available, reflected in their premium pricing. For instance, a Queen size i8 mattress is priced at $3999. However, Sleep Number often runs discounts, especially around major bank holidays like Memorial Day and Labor Day, potentially making these high-tech mattresses more accessible financially.





38″ x 75″ x 12″


Twin XL

38″ x 80″ x 12″



54″ x 75″ x 12″



60″ x 80″ x 12″



76″ x 80″ x 12″


Split King

76″ x 80″ x 12″


Flex Top King

76″ x 80″ x 12″


California King

72″ x 84″ x 12″


Split Cal King

72″ x 84″ x 12″


Flex Top Cal King

72″ x 84″ x 12″


*Prices may be subject to change.

Common Complaints of the Sleep Number Beds?

Lack of transparency from Sleep Number seemed to be a leading complaint.  If you are thinking of purchasing a Sleep Number, we would strongly advise you to thoroughly read through their warranty and sleep trial conditions.  As we mentioned earlier, while the mattress is eligible for a 100-night sleep trial, this does not include the adjustable base, which is considered a final sale.
We’ve also seen a number of complaints regarding Sleep Number standing behind their warranty, with hidden fees and service issues being a leading gripe.

As well as a number of complaints regarding sagging and discomfort of the mattress over time. While minor indentations and wear and tear are common in older mattresses, Sleep Number consumer reviews seem to indicate an unusual amount of degradation.

Lastly, we strongly recommend an air bed that offers multiple air chambers per side with the ability to adjust the lumbar region independently from the neck and shoulder and hips and legs.  We also encourage looking for an air bed that has reinforced foam support between either side of the bed. This will eliminate partners rolling into the center of the mattress.

Related: Best Sleep Number Alternatives

Sleep Number Mattress Review Conclusion

Recommended for:

  • Those seeking a variety of comfort options thanks to Sleep Number’s extensive lineup.
  • Couples desiring different firmness settings and appreciating dual adjustability.
  • Individuals interested in sleep tracking technology.
  • Hot sleepers looking for cooling solutions.

Might not be ideal for:

  • Couples may find the lack of a reinforced support bar leads to a “trench effect,” where rolling to the center occurs.
  • Budget-conscious shoppers looking for an affordable mattress option.

Searching for the perfect mattress? Let ASL Reviews help, our in-depth mattress reviews can help you decide which mattress is right for you.

Sleep Number Alternatives

Eight Sleep vs Sleep number beds

Sleep Number and Eight Sleep both offer sleep tracking but diverge in features. Unlike Sleep Number’s adjustable air beds, Eight Sleep’s mattress doesn’t offer customizable firmness, focusing instead on temperature regulation. The Eight Sleep Pod 3 provides both cooling and heating, adjustable from 55 to 110 degrees Fahrenheit, with dual adjustability for temperature. This distinction highlights Sleep Number’s adaptability in firmness versus Eight Sleep’s advanced temperature control capabilities, catering to different preferences in mattress technology.

Learn more in our Eight Sleep Review.

Air-Pedic vs Sleep number

Both Sleep Number and Air-Pedic allow for customizable firmness, yet they differ significantly in their approach. Air-Pedic elevates customization with six separate air chambers for more targeted support and includes independent lumbar adjustment, unlike Sleep Number’s two chambers. In addition to providing more precise support, this eliminates the trench effect, providing an even sleep surface.

Sleep Number, however, incorporates sleep tracking for a tech-enhanced rest experience, a feature absent in Air-Pedic models. Thus, Sleep Number appeals to those valuing technology in their sleep, while Air-Pedic focuses on providing detailed physical support and comfort through advanced customization.

Learn more in our Air-Pedic Mattress Review.

Purple vs Sleep number mattresses

The Purple and Sleep Number mattresses offer unique sleep experiences. Both feature innovative technologies for comfort and support, with Sleep Number providing adjustable firmness through air chambers and sleep tracking, while Purple offers a unique grid design for pressure relief and cooling.

Purple’s mattress is well-regarded for its cooling capabilities, making it ideal for hot sleepers, and its medium firmness caters to a wide range of sleep positions. In contrast, Sleep Number’s customizable firmness suits varying preferences, especially for couples with different comfort needs.

Learn more in our Sleep Number vs Purple Mattress Comparison.

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This Post Has 22 Comments

  1. arlynn (c4)

    BUYERS BE WARE!!!!! NEVER BUY A SLEEP NUMBER BED!!!! I am a previous owner of a sleep number bed….. had one for nearly 20 years and loved, loved, loved it. When it started losing air from it’s chambers I knew sadly it was time for a new one, which was OK… 20 years was a good run, however, I was not in the financial position to buy another sleep number so bought a standard mattress. I never slept well on the standard mattress, so after a couple years I bit the bullet and bought another sleep number. BAD MOVE. I have NOT been able to sleep on my new bed due to an awful odor since I’ve had it…. now 6 weeks… I tried many times but would wake up with swollen eyes, stuffy nose and a roaring heardache! After speaking with several representatives they explained it as “off gasing” …very common. They offered to exchange my mattress for another but I would probably have the same problem! (They have changed the materials that the beds are made of $$$$) Oh, by the way they hauled away my standard mattress ($800) and if I returned their bed I would be without any mattress plus the cost of buying a new one! So needless to say I have been forced to sleep in the guest bedroom! I WOULD NEVER, EVER RECOMMEND A SLEEP # BED TO ANYONE EVER AGAIN ! THEIR PRODUCTS AND SERVICE HAVE SEVERLY DETERIORATED!!!

  2. Dennis (Not sure, C-5)

    Purchased our Sleep Number bed in Sept. 2017, in Sept. 2021 they want me to pay $162 for a sleep number foam topper because theirs has collapse where your shoulders and butt rest.
    Our bed came with a 20 YEAR warrantee, we used it for 4 years, that’s 20% of it’s life. They want $162 for something I can buy for $60 to $100 anywhere.
    Their warrantee is worthless, customer service told me her hands were tied and switch me over to a supervisor. I asked her how they done their math ? Said 4 years is a fifth of 20 years, the most I should pay is a fifth of the cost. She hung-up on me. Don’t know if she knows math or not ? NOT a good company to do business with !

    1. ASL Reviews

      Oh goodness! They hung up on you? I’m so sorry to hear you are going through that. Unfortunately, it is all too common we hear horror stories when customers have to deal with the customer service department. I sincerely hope you are able to get this resolved as quickly and easily as possible moving forward.

  3. Steve B Cazier

    I purchased a $7,000.00 bed from this company. Year one the heaters had to be replaced $100.00 service call. Waited 2-3 weeks for service.
    Year 2. Left side of bed keeps loosing air and I sleep on the hard surface ,most of night snd getting worse. Called customer support. They wanted me to diagnose the problem, then they could send an air tube or a pump or msbe connectors were bad. 77 years old, disabled veteran I can not take apart the bed to help them diagnose the problem. I ask for someone to come and diagnose the problem, $99.00 to the problem. Then they have to order and wait a week for delivery. Part could cost $200.00+ to #400.00 for a pump. Then they tell me that it takes from today , 02/19//2021 until 03/24/3021, somewhat over a month for a service call. Then other 5 to 10 days go deliver the parts.
    Told them to come and get bed. Did not want the piece of s…, any more.
    A disabled veteran, 77 years old sleeping on a deflated mattress, just like Vietnam all over again after 50 years later

    Will go buy a real bed at Costco for less money and more reliable, better service. This is not spam , this is a real review let consumers know the way things go at sleep number.

    1. ASL Reviews

      Hi Steve, first and foremost we would like to thank you for your service! I apologize that we were not able to get back to you immediately, we were not withholding your review. We do have a spam filter so that inappropriate content and spam don’t clutter our comment section. And we work to review and approve comments as quickly as possible.

      That being said I want to say how terribly sorry I am to hear of your experience with Sleep Number. As you can see in our reviews we do point out to potential shoppers common customer service complaints. We do not work for, nor are we, affiliated with Sleep Number. We welcome all feedback regarding products as shown in our comment thread. We value your feedback and hope it helps others in their journey to finding the right mattress for them. I absolutely understand how incredibly frustrating it is to spend so much money and not receive good customer service. I hope you are able to resolve the matter and get back to better sleep soon!

  4. Anonymous

    Totally agree with all the negative comments. We purchased a sleep number i10 in 2016 California King ($9000.00). Leaks air (avr. 30# each night both sides), sags in the middle and installers made error in installation. They were here 15min and moved very fast saying they had 3 more installations to do and it was already the afternoon. Since then nothing besides trouble and no one could help or seemed interested for that matter. Got shuffled around and finally they got tired of me and they just hung up. How’s that for customer service. Now besides a neck and back ache I have a terrible ache right where my wallet would be, you know where that is, over my left glut.

    1. Steve B Cazier

      I understand your feelings

    2. Mimzy

      I was considering buying one, appreciate your information. I’m sorry you have to put up with the hassle.

      Thank you again.

  5. Patty

    Just bought one a month ago. All night long it adjusts itself without the remote. Inflates, deflates. Spent $5000 on a piece of crap!

  6. William Kirk

    We purchased iLE Limited Cal-King in 2016 along with a queen. The main problem is with the Cal-King the quilted cover has crushed down where you sleep which puts you in a hole, also both remotes are hard to push to inflate or raise the beds. No what we expected for the price we paid.

  7. Susan

    I don’t have an I8, but the Sleep Number mattress we bought is awful. My husband and I both hate it. I have tried every level from 30 to 100 and I still have back pain. Good luck getting any sympathy from their “customer support.” Some nights I go to the guest room and sleep on the old innerspring mattress. It is much more comfortable and I don’t wake up with low back pain. Do not waste your money on any Sleep Number product.

  8. Katie

    My spouse purchased one of the latest sleep number beds. It’s like 2 twin beds together and the top and bottom will raise up. While the mattresses feel pretty good, I really hate the bed. My hand slides down between the mattresses at times during the night. That’s aggravating. If you want to snuggle at all, you can forget it. Might as well be sleeping in another room. If a little one in the family has a rough night and you put them in bed with you, if they are small beware, part of them can go in between the mattress. You have to fill the open area with a blanket and it’s uncomfortable for them. It’s ridiculous. The bed is fairly high. I didn’t put the plush stuff on my side because I’m short. I’m 5’1″. I have difficulty getting on the bed. The plush makes it higher and I don’t need that. Also, the bed doesn’t look real good because one side looks lower than the other for these reasons. We have had it only a matter of months and my right hip hurts from getting up on the bed. And you just don’t need all that technology on the bed! That’s crazy, too. It was also a ridiculous price. Omg! We will owe for a long time on a bed I hate. I’m so sorry my spouse bought this. But we had the first sleep number that came out. Low to the ground and so comfy. Loved it. But this one, no way. : (

  9. Kellie

    Worst bed ever it smells so bad the foam smells like a toxic cocktail that you do not want to sleep on . I have to sleep on a blowup air mattress in the living room because I cannot stand the smell of the bed. Thanks sleep number for all the lies and deceit. I asked specifically if this bed smells like foam and she told me no that was a complete lie

  10. Kelley

    We just bought the sleep number bed number six we are having an awful time sleeping on it due to the awful smell of the foam. every morning we wake up stuffy and feeling really terrible. the foam smell is so overpowering it burns my lungs every single night. I have resorted to sleeping on an air mattress outside of the bedroom so I don’t have to smell the stinky foam. We have had the bed for three months and the smell seems to be getting worse. Worst decision we have ever made waste of $3000

  11. Stephanie G

    I also bought a twin size sleep number bed which lost air during the night. I called and did some trouble shooting with no luck. They wanted to send a pump out and they would install it, but I would need to take the day off of work. This does not work for me so I am returning the bed and they are charging me $199.00 to pick up their defective bed??? Not happy will never buy or recommend a sleep number bed to anyone. I will go out of my way to tell people this!!

  12. Millie Cunningham

    I bought a sleep number bed in August 2019,a week later it stopped working. They tried to give me more numbers to call, saying that after one week the warranty goes to another company.
    They replaced my bed three months later, it still has had issues with the responsive air not working, bed won’t elevate sometimes .It’s constantly problematic to raise the head up.I have to get a supervisor on the phone to help me most of my calls ,the people who first listen to my complaint tell me that I have to pay 199.00 for someone to come out! The bed is 3 months old!!
    Customer relations told me today that they are sending me a new pump to install MYSELF, or I could pay 199.00 fee! What is wrong with these people??? This is not customer service, NOT the kind of place to do business with. I would not recommend a sleep number bed, simply because of all the problems getting it to work! A new bed shouldn’t have these problems.

  13. Javier

    Agree with you, worst customer service, I will never buy from then again!

  14. Rebecca Dorney Farrer

    What bed do you like as opposed to this one?

    1. ASL Reviews

      Hi Rebecca! While Sleep Number is well known, we found that having only one air bladder per side can create a hammock effect and long term issues with support and proper alignment. We would highly recommend either Air-Pedic (with 3 air chambers each side) or Rest Performance (with 5 per side). Air-Pedic is made with CertiPUR-US certified foams, so if eco-friendliness is an important benefit for you Air-Pedic is definitely your best bet. To see how they all compare check out our air bed comparison.

  15. Shelby

    We recently purchased an I8 king bed and we are disappointed in it . Our bed doesn’t adjust the way it’s advertised in fact it is totally killing my shoulder and back! Another thing they won’t let you return the frame and that’s half the price of the bed !! What are you going to do with a frame that won’t fit another bed!! Be very aware before you purchase this bed!!!!

    1. ASL Reviews

      Hi Shelby, We also had the i8 with the adjustable base and now use the Airpedic with the adjustable base. We ended up ordering the remote so we could use it to adjust the frame. I have to admit the frame remote doesn’t always connect to the wifi like we would like it to but it does the job. We are much happier with the Airpedic because it offers more support than the Sleep Number. It has the additional air chamber in the lumbar region to provide the extra support needed. I hope this helps and let me know if you have any other questions.

  16. Judy

    Save your money. DO NOT BUY A SLEEPNUMBER BED THEY DO NOT STAND BEHIND THEIR PRODUCT THEY WANT YOU TO PAY TO HAVE IT REPLACED. To reinstall bed that is defective within less than a year. I have been back and forth with sleepnumber. My bed mattress is sunk in. Worse bed I have ever own. Run fast away from this product.

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