Split King: Adjustable Beds and Mattresses

By McKenzie Hyde
Last Updated On February 7th, 2020

One struggle couples may face is finding the best mattress to accommodate both sleep needs. Over 70% of Americans struggle with sleep, and the problem could be sleeping on the…

Split King: Adjustable Beds and Mattresses

One struggle couples may face is finding the best mattress to accommodate both sleep needs. Over 70% of Americans struggle with sleep, and the problem could be sleeping on the wrong bed. For couples, we recommend a split king size mattress and upgrading to an adjustable base so each sleeper can get peaceful, comfortable rest.

What is a Split King Size Mattress?

A split king size mattress contains two twin XL beds placed side by side. Split king mattresses are the perfect option for couples with differing sleep preferences—improving sleep quality without one partner having to compromise on comfort and support.

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Couples usually buy a split king mattress, not just for personalized comfort, but to pair with an adjustable base.

Adjustable Bed Base

An adjustable bed base is an electronically-powered bed frame, elevating the whole mattress or two separate mattresses, like a split king. An adjustable frame has a power base with retainer bars to hold the mattress in place. As the sleeper elevates the bed, Wallhugger® engineering keeps the bed in place and prevents it from shifting forward. Some models have adjustable legs to alter the height.

Adjustable bed frames were first constructed for hospitals, providing comfort to patients and improving recovery. Today, adjustable beds are a luxury option for the bedroom, controlled with a wireless remote control or through a phone app.

Most mattress companies who offer adjustable bed frames may include white glove delivery service—employees install the adjustable base and remove your old mattress for a hassle-free setup.

Health Benefits

Adjustable beds provide a range of health benefits, including less spinal pressure, anti-snore properties, and reduced acid reflux.

Zero Gravity

The zero-gravity position on an adjustable base elevates the head and legs both to reduce pressure for neck and back pain relief and improve local blood flow for a faster recovery.

Anti-Snore Properties

Elevating the upper body keeps airways open, especially for back sleepers. It also reduces sleep apnea symptoms by preventing the collapse of soft tissue at the back of the throat.

Acid Reflux

Gravity prevents stomach acid from escaping into the esophagus by elevating the upper body. Elevation can also reduce heartburn, improve breathing, and boost heart health.

Special Features

Adjustable beds may come with special features, depending on the brand. Features like USB ports, under-bed lighting, and massage settings add convenience and luxury to the sleeping experience.

  • USB Ports

Some adjustable bases come with USB ports to charge electronic devices, like smartphones. Depending on the model, an adjustable bed can charge up to eight electronic devices (four ports on each side).

  • Under-Bed Lighting

Under-bed lighting provides a gentle night light to guide sleepers if they get up at night.

  • Massage

Many adjustable beds include a massage feature with different intensity settings, aimed to relax the muscles and release tension for better sleep.

Amerisleep Adjustable Bed Package

Right now, we’re offering our Amerisleep Adjustable Bed package, which includes the choice between the AS4, AS3, and AS2 in sizes twin XL, full, queen, or split king, and an adjustable base. Both the adjustable base and mattress come with a 20-year warranty, and the package includes white glove delivery service.

An AS3 split king adjustable bed is available for $5,098, over $1,597 in savings.

Bedding Accessories

Bedding accessories like mattress protectors, bed frames, and mattress toppers aim to give extra protection, appeal, and comfort to your split king mattress.

Mattress Protectors

Mattress protectors shield the mattress from spills and stains and may prolong its lifespan. Mattress protectors are an affordable bedding option, priced between $20 to $40, depending on mattress size. While split king mattress protectors aren’t available, all you need are two twin XL mattress protectors—together, they’re the same size as a split king.

Bed Frames

Bed frames add aesthetic appeal to any bedroom. Before choosing a new frame, measure the dimensions of the mattress—include the adjustable base to make sure a potential bed frame will fit before committing to a purchase.

Mattress Toppers

Mattress toppers are a stand-alone layer that alters the feel of the sleep surface—adding softness to firm beds and support to soft mattresses. Mattress toppers add extra cushioning to any bed for more pressure point relief.

Other Mattress Sizes

If a split king size isn’t your style, check out the following mattress sizes to find the right fit for your bedroom.


Twin size mattresses measure 38 inches by 75 inches and are the smallest standard mattress size available—they’re also the most budget-friendly. Twin beds are the perfect option for children, compatible with bunk beds for more play room. They’re also a good fit for adults with limited living space, like studio apartments.

Twin XL

Twin XL mattresses are similar to a twin size bed, except they have five extra inches in length (38 inches by 80 inches), great for taller individuals who need the legroom. Twin XL beds are standard in college dorm rooms and ideal for children and adults.


Full size mattresses, also known as “double beds,” measure 56 inches by 75 inches, giving more room to sprawl out. Full-size beds are perfect for teenagers and single adults.


Queen size mattresses are the most popular mattress size among single adults living on their own. Queen size beds are 60 inches by 80 inches, with extra width and length to accommodate all types of sleepers. They fit best in smaller master bedrooms.

Split Queen

Split queen size mattresses are the same size as a queen bed, just split into two separate beds. While not as common as a split king, split queen mattresses offer individual comfort for couples who like to sleep close to each other.


King size mattresses are 76 inches by 80 inches—the largest standard mattress size on the market. King size beds are perfect for couples, allowing 38 inches of personal space, more than any other mattress size. King beds are a great addition to large master bedrooms (at least 12 feet by 12 feet).

California King

California king size mattresses are similar to king-size beds—both have the same surface area and are available in split sizes, except Cal king beds are longer and narrower, measuring 72 inches by 84 inches. California king beds are great for taller couples.

Split California King

Split California king mattresses are two separate beds pushed together, offering personalized comfort and support for couples. Split Cal king beds give 36 inches of personal space—2 inches less space than a split king bed, but 4 inches extra length.


What kind of mattress can be used with an adjustable bed?

Latex and memory foam mattresses are the best for an adjustable base—they’re easier to maneuver without risk of damage.

What sheets do you use on a split king adjustable bed?

Since a split king is two twin XL mattresses side by side, sleepers can use fitted twin XL sheets and a king-size flat sheet on top.

Is it okay to sleep with your legs elevated?

Sleeping with your legs elevated may improve sleep quality. Elevating your legs above your heart reduces pressure and improves blood flow.

Finding the Right Split King Size Mattress

Split king size mattresses are the perfect choice for couples—both sleepers can rest on a bed designed to suit their needs. Plus, with the addition of an adjustable base, couples receive better health benefits, like sleep apnea relief and better heart health.

About the author

McKenzie Hyde is a Certified Sleep Science Coach and a full-time writer focused on sleep health and the mattress industry. She currently writes articles on a variety of topics, ranging from sleep hygiene to the newest trends in the mattress and bedding industry. Just some of the topics she has covered include best sleep practices for students, the consequences of going without sleep, and choosing the right bed if you suffer from back pain. McKenzie Hyde holds a Master of Arts degree from Utah State University where she studied literature and writing. While there, she taught argumentative writing and wrote a variety of articles and analyses for literary and academic journals.

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