Hypnos King Size Mattresses

Why choose a Hypnos king size mattress?

A Hypnos king size mattress is a luxurious choice for couples who want more room and carefully handcrafted support. Hypnos mattresses combine responsive pocket springs with generous layers of natural and responsibly sourced materials, creating a comfortable and breathable sleep surface. 

A king size gives you extra width and length compared with a double, while remaining more compact than a super king. With different tensions and fillings available, you can choose the Hypnos mattress that best suits your preferred feel.

How to choose the right Hypnos king size mattress

A king-size gives two sleepers more room than a double, so it is worth comparing comfort, support, and edge strength carefully. Start with the tension you prefer, then look at the spring system, fillings, mattress depth, and care instructions.

Then compare:

• Tension: Medium, medium-firm, firm, and extra firm models all feel different, so choose based on sleep position, body weight, and preferred comfort.

• Spring system: ReActive™ and ReActivePro™ pocket springs respond to changes in weight and position, helping each sleeper feel supported separately.

• Edge support: Reinforced edges help you use more of the 150cm width, which is especially useful on a shared king-size bed.

• Fillings: Compare natural wool, cotton, recycled fibres, pillow-top layers, and any organic materials listed on the product page.

• Collection: Origins, Organic, Orthos, and Pillow Top designs can feel very different, even when they share the same size.

• Access: King-size mattresses are larger and heavier than doubles, so measure the route to your bedroom before ordering.

Understanding king-size dimensions: Will a 150cm mattress fit your room?

A standard UK king-size mattress measures 150cm x 200cm, or 5ft x 6ft 6in. It's 15cm wider and 10cm longer than a standard double, giving couples more personal space and taller sleepers more length.

Before ordering, measure the inside of your bed frame, not just the outside. You should also check the delivery route from your front door to the bedroom, including stairs, corners, doorways, and tight landings.

As a simple room-fit guide, allow enough space to walk around the bed and open wardrobes or drawers comfortably. If your bedroom already feels tight with a double, check whether the extra 15cm width and 10cm length will still leave enough usable floor space.

Because king-size mattresses are larger and heavier than doubles, access matters too. If stairs, hallways, or doorways are tight, a Zip and Link option may be easier to move, as the mattress arrives as two separate sections.

Why shop at MattressNextDay?

Next day delivery - Choose an eligible, in-stock mattress for free next day delivery to most locations.

Lowest price promise - We monitor competitors’ prices every 24 hours, giving you added reassurance that your chosen Hypnos mattress is competitively priced.

Old mattress removal - Add removal for £39 at checkout and we’ll take your old mattress away when the new one arrives.

Excellent reviews - Read thousands of verified customer reviews covering our products, ordering experience and delivery service.

Award-winning retailer - Order from a three-time NBF Online Bed Retailer of the Year, recognised for online mattress expertise and customer service.

British-designed quality - Mattresses designed in Britain using established bedmaking techniques and responsibly sourced materials.

Need help choosing your next mattress?

Tell MattressFinder™ how you sleep, which feel you prefer, and what you want to spend. It’ll narrow down the range so you can compare suitable mattresses without searching every product. Find your perfect mattress.

Buying guidance for Hypnos king size mattresses

Choosing the right Hypnos king size mattress comes down to how you want the bed to support you and your partner. Explore the available pocket spring systems, then consider whether a Zip and Link design could provide the comfort, flexibility and easier delivery you need.

Innovative pocket spring technology

Hypnos king-size mattresses feature responsive pocket spring systems that support each sleeper individually. This is especially useful in a larger shared bed, where both people may have different body weights, sleep positions, and comfort preferences.

ReActive™ pocket springs respond individually as weight and sleeping position change, helping the mattress offer more targeted support across the surface.

ReActivePro™ pocket springs are used in selected models and may be paired with Triple Edge Protection™ for a steadier edge and more usable sleeping space.

The number of active turns can vary between models. Springs with more turns are designed to react more quickly to movement, so compare the spring specification alongside the firmness rating, fillings, and mattress depth.

Zip and Link: The king-size solution for couples with different needs

Selected Hypnos king-size mattresses are available as Zip and Link options. This means two separate mattress sections can be joined together to create one king-size sleeping surface, or separated when needed.

Zip and Link can be useful if:

• You and your partner prefer different comfort levels

• You want separate sleeping surfaces with less movement between sides

• You need easier access through narrow stairs, doorways, or hallways

• You want flexibility for a guest room

Availability varies by model, size, and tension, so check the product page for the current Zip and Link options before ordering.

Delivery, recycling, and guarantees

Free next-day delivery to most locations - Choose an eligible, in-stock Hypnos double mattress and order before the relevant cut-off for free next day delivery to most UK mainland locations.

Free weekend delivery - Select free weekend delivery where available, giving you more choice if weekdays are difficult.

Choose a delivery date - Pick an available date at checkout so you can prepare the room and arrange old mattress collection in advance.

Learn more about our delivery and returns policies.

We make old mattress disposal easy for you

Just £39 to responsibly dispose of your old mattress - Add old mattress removal at checkout, and we’ll collect it when your new Hypnos mattress arrives.

100% of your mattress is reused and recycled - Your old mattress will be broken down so its materials can be reused and recycled, keeping bulky waste out of landfills.

A greener way to get rid of your old mattress - Collection takes place alongside delivery, so you don't have to move a heavy mattress or arrange disposal separately.

Find a great value Hypnos king size mattress

Browse the MattressNextDay sale for current offers across mattresses, beds, and sleep essentials, including selected products from trusted British brands. Shop mattress sale.

Ask the expert about Hypnos king size mattresses

Still comparing tensions, fillings, collections, and Zip and Link options? These answers cover the practical details to help you choose a Hypnos king-size mattress for a single sleeper or a couple.

Martin Seeley, Product Expert at MattressNextDay, answers questions about Hypnos king-size mattresses.

Will a king-size mattress fit my bedroom?

Measure the room, bed frame, and access route before ordering. A king-size mattress is 15cm wider and 10cm longer than a double, so check that there is still space to walk around the bed and open drawers, wardrobes, or doors comfortably.

What bed base should I use with a Hypnos king-size mattress?

Hypnos king-size mattresses can usually work with suitable divans and bed frames, but the base should be supportive, level, and in good condition.

If you are using a slatted frame, check the slat spacing and make sure the slats are not damaged or bowed. A divan base can create a steadier foundation, while sprung slats may add a little more give.

Is a Hypnos king-size mattress good for couples?

Yes, a Hypnos king-size mattress can be a strong choice for couples because it gives both sleepers more space than a double mattress, while remaining practical for many UK bedrooms.

Pocket springs respond individually to changes in weight and sleeping position, helping the mattress support each sleeper separately. This can reduce the amount of movement travelling across the bed when one person turns over or gets up.

Edge support is especially important in a king-size. Reinforced edges can make more of the mattress surface comfortable to use, helping both sleepers settle closer to the sides without the bed feeling less stable.

Can couples choose different firmness levels on a Hypnos king-size mattress?

A standard one-piece king-size mattress has a single comfort rating across its full surface. If you and your partner need different feels, check selected Hypnos Zip and Link options, which may allow more flexibility depending on the model.

What is a Hypnos Zip and Link mattress?

A Zip and Link mattress consists of two separate mattress sections that can be joined or separated. It can help with access through tight spaces and may suit couples who want separate sleeping surfaces.

What is the difference between Hypnos Organic and Origins mattresses?

Hypnos Organic models focus on natural comfort and certified or carefully sourced materials. Origins models offer a traditional Hypnos feel, often using natural wool, cotton, and responsive pocket springs.

Check each product page for the exact fillings, certification details, comfort rating, and guarantee.

What are Hypnos ReActive™ pocket springs?

ReActive™ pocket springs are individual springs that respond independently as weight and sleeping position change. Selected Hypnos models use ReActivePro™ springs or reinforced edge support for a steadier feel across more of the mattress surface.

Do Hypnos king-size mattresses need turning?

It depends on the model. Some Hypnos mattresses are single-sided and only need rotating from head to toe, while double-sided designs need turning as well.

Check the care instructions before ordering, especially if lifting a large king-size mattress may be difficult.

Which Hypnos king size mattress collection is right for me?

The right Hypnos collection depends on the level of firmness, cushioning and natural comfort you prefer. Use this comparison to narrow down your options, then check the current product range, as availability can vary.

Use the collection or style as your starting point, then compare the comfort rating, spring system, fillings, mattress depth, care instructions and guarantee before making your choice.

Do Hypnos king-size mattresses have a 10-year guarantee?

Selected Hypnos king-size mattresses include a 10-year manufacturer’s guarantee, while others may have a different cover. Registration may be required, so check the product page and complete any required steps after delivery.