King Size Sleep Number

King Size Sleep Number mattresses offer a spacious and customizable sleep solution for those seeking personalized comfort. Perfect for couples or anyone who enjoys extra room to stretch out, these king size options provide the ideal blend of luxury and support. Explore a variety of choices designed to suit your unique sleep preferences and create the restful retreat you deserve with a King Size Sleep Number mattress.

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Sleepy's Basic Adjustable Base

Starting at

$500⁹⁹

FREE with select mattress purchase³.

Sleepy's Basic Memory Foam Firm Mattress

2701

Starting at

$300⁷⁷

$1000⁹⁹

$700 OFF

Firm Comfort, best for

Back;Stomach Sleepers
Pain;Bed Partner;Temperature;Toss and Turn
Support
Temperature

Tempur-Pedic TEMPUR-Ergo Smart Adjustable Base

725

Starting at

$2699⁰⁰

Calm app 3-month free trial with mattress purchase & registration

Nectar Premier 13" Medium Memory Foam Mattress

179

Starting at

$1099⁰⁰

$1799⁰⁰

$700 OFF

Medium Comfort, best for

Back;Side;Stomach Sleepers
Pain;Bed Partner;Temperature;Toss and Turn
Bed Partner
Temperature

Tempur-Pedic TEMPUR-ProAdapt 12" Medium Mattress

3407

Starting at

$4099⁰⁰

Medium Comfort, best for

Back;Side;Stomach Sleepers
Pain;Allergies;Bed Partner;Toss and Turn;Toss and Turn
Bed Partner
Temperature

Receive $300 Instant Gift⁴ with purchase + Calm app 3-month free trial

Tempur-Pedic TEMPUR-Adapt 11" Medium Mattress

3144

Starting at

$2899⁰⁰

Medium Comfort, best for

Back;Side;Stomach Sleepers
Pain;Temperature;Allergies;Bed Partner;Toss and Turn;Toss and Turn
Bed Partner
Temperature

Receive $300 Instant Gift⁴ with purchase + Calm app 3-month free trial

Tempur-Pedic TEMPUR-Adapt 11" Medium Hybrid Mattress

2347

Starting at

$3199⁰⁰

Medium Comfort, best for

Back;Side;Stomach Sleepers
Pain;Temperature;Allergies;Bed Partner;Toss and Turn;Toss and Turn
Bed Partner
Temperature

Receive $300 Instant Gift⁴ with purchase + Calm app 3-month free trial

Beautyrest PressureSmart 2.0 Lux Firm Pillow Top 16.25" Mattress

1229

Starting at

$2200⁹⁹

$3250⁹⁹

$1050 OFF

Firm Comfort, best for

Back;Stomach Sleepers
Pain;Bed Partner;Temperature;Allergies;Toss and Turn;Toss and Turn
Temperature
Bed Partner

FREE ADJUSTABLE BASE ³ up to 499 value with code ELEVATE (must add base to cart)

Sealy Posturepedic Elite Brenham II 15" Medium Mattress

240

Starting at

$2499⁰⁰

Medium Comfort, best for

Back;Side;Stomach Sleepers
Pain;Temperature;Allergies;Bed Partner;Toss and Turn
Temperature
Allergies

Receive $200 Instant Gift⁴ with purchase.

Sealy Posturepedic Plus Hybrid Norman II 13" Medium Mattress

127

Starting at

$2099⁰⁰

Medium Comfort, best for

Back;Side;Stomach Sleepers
Pain;Allergies;Bed Partner;Toss and Turn
Allergies

FREE ADJUSTABLE BASE ³ up to $499 value with code ELEVATE (must add base to cart)

Beautyrest Black Hybrid Series One 12.5" Firm Mattress

Starting at

$2599⁰⁰

Firm Comfort,

Pain;Bed Partner;Temperature;Toss and Turn
Bed Partner
Temperature

$300 ⁶ adjustable base instant gift with purchase.

Sealy Posturepedic Plus Norman II 15" Medium Euro Top Mattress

Starting at

$1499⁰⁰

$2099⁰⁰

$600 OFF

Medium Comfort, best for

Back;Side;Stomach Sleepers
Pain;Allergies;Bed Partner;Toss and Turn
Allergies

FREE ADJUSTABLE BASE ³ up to $499 value with code ELEVATE (must add base to cart)

Sealy Posturepedic Pro Lacey II 14" Medium Mattress

Starting at

$2299⁰⁰

Medium Comfort, best for

Back;Side;Stomach Sleepers
Pain;Temperature;Allergies;Bed Partner;Toss and Turn
Temperature
Allergies

FREE ADJUSTABLE BASE ³ up to $499 value with code ELEVATE (must add base to cart)

Sierra Sleep Ashley Peak 2.0 8" Hybrid Mattress

Starting at

$370⁹⁹

$1150⁹⁹

$780 OFF

Medium Comfort, best for

Side;Back;Stomach Sleepers
Pain
Bed Partner
Toss and Turn

Sleepy's Signature Total Defense Mattress Protector

3873

Starting at

$130⁹⁹

Temperature;Allergies
Allergies

Save $100 when you bundle¹⁰. Use Code: SIGNATURE

Sleepy's Basic Innerspring Firm Mattress

8308

Starting at

$300⁹⁹

Firm Comfort, best for

Back;Stomach Sleepers
Temperature;Pain;Bed Partner;Allergies;Toss and Turn

Sleepy's By Sealy Medium Euro Top Mattress

3666

Starting at

$600⁹⁹

Medium Comfort, best for

Back;Side;Stomach Sleepers
Bed Partner;Pain;Temperature;Toss and Turn;Toss and Turn
Temperature
Bed Partner

Queen mattress & base now $499 with code ELEVATE (must add base to cart)

Sleepy's Elite Adjustable Base

860

Starting at

$1900⁹⁹

Save up to 499 with qualifying mattress purchase. Code: ELEVATE

Sleepy's By Sealy Slumber Cushion Firm Mattress

247

Starting at

$2000⁹⁹

Medium Comfort, best for

Back;Side;Stomach Sleepers
Bed Partner;Toss and Turn;Pain;Temperature
Toss and Turn
Pain

FREE ADJUSTABLE BASE ³ up to $499 value with code ELEVATE (must add base to cart)

Beautyrest BR800 12" Plush Euro Top Mattress

645

Starting at

$1400⁹⁹

Plush Comfort, best for

Side Sleepers
Toss and Turn;Pain;Bed Partner;Temperature
Pain
Bed Partner

FREE ADJUSTABLE BASE ³ up to 499 value with code ELEVATE (must add base to cart)

Bedgear Hyper-Cotton Sheet Set

Starting at

$250⁹⁹

Pain;Bed Partner;Toss and Turn
Allergies

Nectar Luxe 14" Medium Memory Foam Mattress

201

Starting at

$1499⁰⁰

$2249⁰⁰

$750 OFF

Medium Comfort, best for

Back;Side;Stomach Sleepers
Pain;Bed Partner;Temperature;Toss and Turn
Bed Partner
Temperature

Sleepy's Signature Harper Headboard

Starting at

$330⁹⁹

Tempur-Pedic TEMPUR-LuxeAdapt 13" Firm Mattress

1268

Starting at

$5399⁰⁰

Firm Comfort, best for

Back;Stomach Sleepers
Pain;Temperature;Allergies;Bed Partner;Toss and Turn;Toss and Turn
Bed Partner
Temperature

Receive $300 Instant Gift⁴ with purchase + Calm app 3-month free trial

Sleepy's Signature Tall Channel Tufted Upholstered Platform Bed

Starting at

$600⁹⁹

Sleepy's By Sealy Memory Foam Firm Mattress

2701

Starting at

$1350⁹⁹

Firm Comfort, best for

Back;Stomach Sleepers
Pain;Bed Partner;Toss and Turn
Bed Partner
Toss and Turn

FREE ADJUSTABLE BASE ³ up to 499 value with code ELEVATE (must add base to cart)

King Size Sleep Number

When considering the purchase of a king size adjustable mattress, many shoppers are drawn to the promise of personalized comfort and advanced sleep technology. A king size bed offers an expansive sleep surface that’s perfect for couples who value their own space or for families who enjoy weekend mornings spent lounging together. The flexibility of an adjustable mattress means each sleeper can customize their side of the bed, adjusting firmness or elevation to match their unique preferences. This is especially beneficial for those with varying sleep styles—whether you’re a side sleeper needing extra cushioning or a back sleeper seeking firmer support, the adaptability of these mattresses ensures you both wake up refreshed. As September brings cooler nights and the subtle shift of seasons, there’s something deeply comforting about settling into a bed that feels just right, tailored to your body and your needs. Picture yourself unwinding after a long day, reading a favorite book or watching a movie propped up comfortably, all thanks to the intuitive adjustability of your king size mattress.

These mattresses are a thoughtful gift for newlyweds setting up their first home, parents looking to upgrade their master suite, or anyone celebrating a milestone—a new house, an anniversary, or a birthday. They’re also ideal for anyone who deals with nighttime discomfort, such as chronic back pain or circulation issues, as the ability to fine-tune the bed’s settings can make a significant difference in sleep quality. For families with young children, the generous dimensions of a king size bed make it easy to accommodate little ones seeking comfort during thunderstorms or early morning cuddles. With autumn’s arrival, many people begin to focus on creating a cozy, restful retreat in their bedrooms, and investing in a king size sleep number mattress firm option can be a transformative step toward better sleep and overall well-being. The decision to upgrade often comes from recognizing how much our daily energy, mood, and productivity depend on the quality of our rest. If you’re ready to explore the latest in sleep technology and experience the difference a truly personalized mattress can make, take a look at our curated selection of King Mattresses For Sleep Innovations to find the perfect fit for your lifestyle and comfort preferences.