Sleep Number King Size

Sleep Number King Size mattresses offer a luxurious sleep experience designed for those who value space and personalized comfort. Perfect for couples or anyone seeking extra room to stretch out, these king size options bring both style and support to your bedroom. Explore a range of Sleep Number King Size choices to find the perfect fit for your sleep preferences and bedroom décor. Upgrade your rest with a mattress that adapts to your unique needs and delivers exceptional quality night after night.

Show More

Sort & Filter

Basic Memory Foam Firm Mattress

Sleepy's Basic Memory Foam Firm Mattress

Starting at

Firm Comfort, best for

Back;Stomach Sleepers
Pain
Support
Temperature

Basic Innerspring Firm Mattress

Sleepy's Basic Innerspring Firm Mattress

Starting at

Firm Comfort, best for

Back;Stomach Sleepers
Pain

iSeries 2.0 Hybrid 1000 12" Medium Mattress

Serta iSeries 2.0 Hybrid 1000 12" Medium Mattress

Starting at

Medium Comfort, best for

Back;Side;Stomach Sleepers
Temperature
Bed Partner
Pain

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

Perfect Sleeper Charlotte 2.0 Medium Euro Top Mattress

Serta Perfect Sleeper Charlotte 2.0 Medium Euro Top Mattress

Starting at

Medium Comfort, best for

Back;Side;Stomach Sleepers
Pain
Toss and Turn
Pain

iSeries 2.0 Hybrid 2000 12.5" Firm Mattress

Serta iSeries 2.0 Hybrid 2000 12.5" Firm Mattress

Starting at

Firm Comfort, best for

Back;Stomach Sleepers
Temperature
Bed Partner
Pain

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

Perfect Sleeper Sleep Excellence Medium PillowTop Mattress

Serta Perfect Sleeper Sleep Excellence Medium PillowTop Mattress

Starting at

Medium Comfort, best for

Back;Side;Stomach Sleepers
Pain
Toss and Turn
Pain

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

TEMPUR-Adapt 1.0 11" Medium Mattress

Tempur-Pedic TEMPUR-Adapt 1.0 11" Medium Mattress

Starting at

Medium Comfort, best for

Back;Side;Stomach Sleepers
Allergies
Bed Partner
Temperature

TEMPUR-Ergo Smart Adjustable Base

Tempur-Pedic TEMPUR-Ergo Smart Adjustable Base

Starting at

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

BR800 11.25" Firm Mattress

Beautyrest BR800 11.25" Firm Mattress

Starting at

Firm Comfort, best for

Back;Stomach Sleepers
Toss and Turn
Pain
Bed Partner

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

Essentials Sudley 8.5" Firm Mattress

Sealy Essentials Sudley 8.5" Firm Mattress

Starting at

Firm Comfort, best for

Back;Stomach Sleepers
Pain

By Sealy Slumber Cushion Firm Mattress

Sleepy's By Sealy Slumber Cushion Firm Mattress

Starting at

Medium Comfort, best for

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

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

Lavender 8" Medium Memory Foam Mattress

Tulo Lavender 8" Medium Memory Foam Mattress

Starting at

Medium Comfort, best for

Back;Side;Stomach Sleepers
Toss and Turn
Pain
Temperature

Posturepedic Plus Hybrid High Point 14" Plush Mattress

Sealy Posturepedic Plus Hybrid High Point 14" Plush Mattress

Starting at

Plush Comfort, best for

Side Sleepers
Pain
Bed Partner
Temperature

TEMPUR-Adapt 11" Medium Mattress

Tempur-Pedic TEMPUR-Adapt 11" Medium Mattress

Starting at

Medium Comfort, best for

Back;Side;Stomach Sleepers
Pain
Bed Partner
Temperature

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

TEMPUR-Adapt 11" Medium Hybrid Mattress

Tempur-Pedic TEMPUR-Adapt 11" Medium Hybrid Mattress

Starting at

Medium Comfort, best for

Back;Side;Stomach Sleepers
Pain
Bed Partner
Temperature

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

TEMPUR-Adapt 1.0 11" Medium Hybrid Mattress

Tempur-Pedic TEMPUR-Adapt 1.0 11" Medium Hybrid Mattress

Starting at

Medium Comfort, best for

Back;Side;Stomach Sleepers
Allergies
Bed Partner
Temperature

Restore Cool Touch 11.5" Hybrid Mattress

Purple Restore Cool Touch 11.5" Hybrid Mattress

Starting at

Medium Comfort, best for

Back;Side;Stomach Sleepers
Temperature
Pain
Bed Partner

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

TEMPUR-ProAdapt 1.0 12" Firm Mattress

Tempur-Pedic TEMPUR-ProAdapt 1.0 12" Firm Mattress

Starting at

Firm Comfort, best for

Back;Stomach Sleepers
Temperature
Pain
Allergies

TEMPUR-ProAdapt 1.0 12" Medium Mattress

Tempur-Pedic TEMPUR-ProAdapt 1.0 12" Medium Mattress

Starting at

Medium Comfort, best for

Back;Side;Stomach Sleepers
Temperature
Pain
Allergies

By Sealy Memory Foam Firm Mattress

Sleepy's By Sealy Memory Foam Firm Mattress

Starting at

Firm Comfort, best for

Back;Stomach Sleepers
Pain
Bed Partner
Toss and Turn

TEMPUR-LuxeAdapt 1.0 13" Soft Mattress

Tempur-Pedic TEMPUR-LuxeAdapt 1.0 13" Soft Mattress

Starting at

Plush Comfort, best for

Side Sleepers
Temperature
Pain
Bed Partner

Lux Estate 16" Medium Euro Pillow Top Mattress

Stearns & Foster Lux Estate 16" Medium Euro Pillow Top Mattress

Starting at

Medium Comfort, best for

Back;Side;Stomach Sleepers
Bed Partner
Pain
Temperature

Receive $300 Instant Gift⁴ with purchase.

TEMPUR-LuxeAdapt 1.0 13" Firm Mattress

Tempur-Pedic TEMPUR-LuxeAdapt 1.0 13" Firm Mattress

Starting at

Firm Comfort, best for

Back;Stomach Sleepers
Temperature
Pain
Bed Partner

TEMPUR-LuxeBreeze Soft 13" Mattress

Tempur-Pedic TEMPUR-LuxeBreeze Soft 13" Mattress

Starting at

Plush Comfort, best for

Side Sleepers
Temperature
Pain
Bed Partner

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

Lux Estate 14.5" Extra Firm Mattress

Stearns & Foster Lux Estate 14.5" Extra Firm Mattress

Starting at

Extra Firm Comfort, best for

Back;Stomach Sleepers
Bed Partner
Pain
Temperature

Receive $300 Instant Gift⁴ with purchase.

Lux Estate 16" Firm Euro Pillow Top Mattress

Stearns & Foster Lux Estate 16" Firm Euro Pillow Top Mattress

Starting at

Firm Comfort, best for

Back;Stomach Sleepers
Bed Partner
Pain
Temperature

Receive $300 Instant Gift⁴ with purchase.

Related Pages

Best Sellers

Signature Total Defense Mattress Protector

Sleepy's Signature Total Defense Mattress Protector

Starting at

Basic Adjustable Base

Sleepy's Basic Adjustable Base

Starting at

Signature Adjustable Base

Sleepy's Signature Adjustable Base

Starting at

Deluxe Comfort Cool Mattress Protector

Sleepy's Deluxe Comfort Cool Mattress Protector

Starting at

Basic Box Spring Foundation

Sleepy's Basic Box Spring Foundation

Starting at

Top Collections

Join today & enjoy an extra 15% off online or in-store

Loading footer...