Split King Mattress: Benefits and Best Options


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Sleep is important to human health, and not getting enough of it can increase your risk for various health conditions. Using a split king-size mattress provides improved motion control and the ability to customize the sleeping arrangement, which can enable better sleep.

Insufficient sleep can lead to high blood pressure, heart disease, type 2 diabetes, stroke, obesity, and certain mental illnesses, according to the Centers for Disease Control and Prevention (CDC).

In addition, many adults sleep with a partner. Research suggests that a healthy co-sleeping pattern is linked to better overall health for the individual and their relationship.

However, people in a couple may not be the same size or have different physical needs, sleep styles, sleep plans, or mattress preferences.

Finding the right mattress for a couple can be tricky. This is where a split king-size mattress can help.

This article explains what a split king mattress is, the possible pros and cons of using one, and some options to try out.

A split king-size mattress consists of two extra large single beds on separate but connected foundations. The base is adjustable and sometimes comes with a remote control.

Because of this, people can raise the different sides of the bed to different heights. The bed takes up about as much space as a king-size mattress.

However, a split king-size mattress also requires a split bed arrangement as the mattresses require two fitted sheets and a king-size top sheet.

Buying a mattress is a significant expense. Before deciding on a split-king option, potential buyers should carefully weigh the pros and cons.

The following sections take a closer look at the potential advantages and disadvantages.


The benefits of using a king-size split mattress can be:

  • Great motion controls: Since this bed is made up of two different mattresses, one person’s movements will not cause the other person to bounce around.
  • Flexibility of mattress preferences: If one partner prefers a firm mattress and the other a softer surface, both can sleep with the firmness and comfort they prefer.
  • Sleep better: Freedom from the partner’s movement disorders and the ability to sleep on their preferred mattress can help both people sleep well.
  • Independent decisions: Each person can choose the type of mattress they want and control the height independently – for example, one partner could read while the other sleeps. Some models also offer options for individual temperature control and more.
  • Easier to move: Moving essentially two twin mattresses can be easier and less cumbersome than moving a king-size mattress.


Some potential downsides associated with using a split king mattress are:

  • Assembly required: Building adjustable bed frames takes time and thought, so couples should be prepared for the hassle of assembling them.
  • Note the gap: Since a split king-size mattress is actually made up of two separate mattresses, there is a gap between the two sides of the bed.
  • More to buy: Buying a king-size split mattress usually means the couple will have to buy new sheets.
  • Price: A split king-size mattress can be more expensive than a traditional king-size mattress, especially considering the adjustable frame and the need for new bedding.

The following sections introduce five king split mattress options that are available for purchase.

Please note that the author of this article has not tested any of these products. All information presented here is purely research-based.

Casper Adjustable Pro

This option comes with mattresses, an adjustable frame and many extras, such as a massage option.

A remote control with custom presets will help people find the heights that are keeping them from snoring, relieve pressure sores, and more.

For the mattresses themselves, people can choose from Casper’s memory foam and hybrid offerings.

The Casper Adjustable Pro is available online here.

Amerisleep AS3

Manufacturers make their mattresses from organic pure foam, which they believe helps reduce the consumption of non-renewable resources.

They designed this mattress to prevent heat build-up by encouraging airflow. They also say it specifically relieves pressure points.

The Amerisleep AS3 can be purchased online here.

Friday mattress

The manufacturers developed this mattress for athletes. It offers support in three zones for the hips and shoulders and promotes optimal alignment of the spine.

It is also made of breathable fabrics, cooling channels and gel memory foam. The memory foam helps to adapt to the contours of the body and still bounce back.

The Zoma mattress can be bought online here.

Stearns & Foster Estate Hurston

This mattress is available in firm, pillow-proof or plush, with firm and plush options also in a pillow top.

It measures 35.6 to 36.8 centimeters thick and has upholstery fabric and copper vents.

The Stearns & Foster Estate Hurston can be purchased online here.

Lucid Comfort Collection 10 inch gel memory foam mattress

This mattress combines memory foam and gel infusions to promote a cool sleep and relieve pressure sores.

It’s hypoallergenic and offers comfort and support while conforming to the contours of the body, according to the manufacturers.

The Lucid Comfort Collection 10 inch gel memory foam mattress is available online here.

Couples looking for adaptability and flexibility in one mattress, but not interested in a king-size split mattress, may be interested in other mattress types.

Other styles that can work well for couples are foldable mattresses, manually adjustable mattresses, and electronically controlled mattresses with adjustable firmness.

The following sections explain some of the options available.

Please note that the author of this article has not tested any of these products. All information presented here is purely research-based.

Saatva Zenhaven latex mattress

Foldable mattresses offer two different types of firmness and support, one on each side.

With this mattress, the buyer can choose between the Luxury Plush side and the Gentle Firm side, which is around 18% firmer.

The Saatva Zenhaven latex mattress is available online here.

ReST Smart Bed

Electronically controlled adjustable firmness mattresses such as these typically use air to provide varying degrees of firmness within the same mattress.

With this mattress, users can select comfort levels for multiple zones and automatically react to individual pressure points.

The ReST Smart Bed is available online here.

Reverie Dream Supreme II hybrid mattress

This is a manually adjustable hardness mattress.

It has foam coils that people can configure according to their needs. Hence, a couple could make one side of the bed firmer and the other side softer, among many other configurations.

The manufacturers also developed this mattress to promote breathability and regulate the sleeper’s body temperature.

The Reverie Dream Supreme II Hybrid Mattress is available online here.

When buying a mattress, there is a lot behind it, from the decision about the preferred degree of firmness to the determination of the individual sleeping style.

The process becomes even more complicated for couples, who can have different physical needs as well as different preferences. Buying a split king mattress can help resolve these issues.

A split king-size mattress essentially consists of two extra-large twin mattresses placed side by side on a single frame. In this way, both partners can choose the degree of hardness that best suits their needs.

Split King mattresses improve motion control dramatically as individuals actually sleep on different mattresses, which can be helpful for couples with very different needs.

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