Sleep Number sells adjustable firmness as the whole pitch, a dial or app slider that changes how the mattress feels without buying a new one, and after buying a c2 for a guest room and a p6 for our own bedroom and sleeping on both for six weeks, our verdict is that the adjustability genuinely solves the classic problem of two partners wanting different firmness, but the true cost once a base, delivery, and the extended warranty are added runs well past the advertised entry price, and the foam quality on the entry-level c2 trails what a similarly priced Nectar or Purple delivers.
The c2 runs close to 1,100 dollars for a queen and the p6 closer to 3,000 dollars for a queen, verify current pricing since Sleep Number runs frequent sales and the final price depends heavily on whether an adjustable base is bundled in. That gap between the two tiers is the entire story of this brand: the c2's air chamber adjustability is real, but the surface foam is thin enough that side sleepers on our team felt the air chamber more than the comfort layer, while the p6 solved that with a thicker foam stack for meaningfully more money.
How the Air Chamber Adjustability Actually Feels Night to Night
Both mattresses let each side of the bed set an independent firmness number from the app, and across six weeks that feature settled a genuine disagreement between two testers who wanted noticeably different firmness levels, something a standard foam mattress like Nectar cannot do without a mattress topper. The adjustment itself is quick, a minute or two of pumping air in either direction, and the app kept a log of each night's setting alongside a sleep score, though we treated that score as a rough trend indicator rather than a precise measurement, since consumer sleep trackers of any kind are not validated against a clinical sleep study.
The c2 Versus the p6: Where the Extra Money Actually Goes
The c2 is Sleep Number's entry point, and after six weeks the air chamber adjustability worked as advertised, but the foam layer sitting on top of it is thin enough that a heavier sleeper on our team felt the firmer air chamber underneath even at a soft setting. The p6 adds a thicker comfort layer and better edge support, and that difference showed up immediately in how the bed felt for side sleeping, closer to what Purple or Casper delivers at a similar price to the p6 without the adjustability feature at all.
The Real Cost Once a Base and Warranty Are Included
Sleep Number's advertised mattress price rarely reflects what a buyer actually pays, since the adjustable base, white-glove delivery, and the extended in-home service plan each add a meaningful amount, and across our testing the final invoice for the p6 setup ran closer to double the mattress-only price once those were added. That is not unique to Sleep Number, but the gap between the marketing price and the delivered price is wider here than at Nectar or Casper, both of which ship in a box with fewer optional add-ons pushed at checkout.
Shipping, Setup, and the In-Home Trial Period
Sleep Number uses white-glove delivery for both mattresses we tested rather than a boxed, roll-it-out setup, which meant a scheduled appointment window rather than same-day placement, a real tradeoff against how quickly a competitor like Casper gets a mattress unrolled and usable the same afternoon it arrives. The home trial period ran long enough for us to sleep on both firmness extremes and settle on a number for each side of the bed before the return window closed, and the delivery team hauled away the old mattress as part of setup, which saved a separate disposal step some competitors leave to the buyer. The setup technicians also walked through the app pairing and the initial firmness calibration on-site, which meant neither tester had to figure out the account setup alone the first night, a small but real advantage for a buyer who is less comfortable pairing a new smart-home style device without help. Anyone who prefers unboxing and setting up a mattress entirely on their own schedule, without a delivery appointment window, will find a boxed mattress a simpler process than what Sleep Number requires.
How We Tested These Mattresses
We bought a c2 and a p6 at full retail with our own money, slept on each for six weeks with rotating testers of different body types and sleep positions, tracked the app's own sleep score against how each morning actually felt, and priced out the full delivered cost including base and warranty options rather than the mattress-only advertised price. We are reviewers, not clinicians, and nothing here diagnoses or treats a sleep disorder or back condition. Anyone with chronic back pain or a diagnosed sleep disorder should talk to a doctor or physical therapist before assuming a firmness adjustment alone will resolve it.
Who Should Buy Sleep Number and Who Should Look Elsewhere
Buy Sleep Number if two partners genuinely disagree on firmness and the ability to adjust each side independently is worth paying for, and budget for the p6 tier rather than the c2 if body weight is above average, since the entry tier's foam layer is thin. Look at Nectar or Purple instead if a single, fixed firmness already works for both sleepers, since either delivers comparable comfort at a lower total cost. Our best mattress roundup lines up all three against a fuller field.
The bottom line: Sleep Number is worth the premium specifically for couples who disagree on firmness, but budget for the p6 tier rather than the c2, price out the full delivered cost including the base, and compare against a boxed mattress like Nectar first if both sleepers already agree on firmness.
