Sleep Number c4 Mattress Review

Scott White
Chief Sleep Researcher
Updated 3 Days Ago

The Sleep Number m7 bed pairs contouring comfort layers with Adjustable Firmness air chambers for personalized back support and pressure relief. This smart bed automatically adjusts each side's preferences like firmness and temperature based on your side sleeping or back sleeping patterns for effortless comfort. A worthwhile investment for unbeatable sleep personalization.


Offers the same level of care and quality across the brand. Buying from an established brand ensures reliability and future customer support.

Offers a range of mattresses with varying comfort levels, all priced affordably under $500. Their pricing is nearly half that of some large brands, making them an excellent choice for budget-conscious shoppers.

Temperature-regulationg materials effectively dissipates excess body heat, ensuring a cool and comfortable sleep environment.

Our Recommendation

While this is a impressive option, one name stands out as our number one pick: the Saatva mattress. We rigorously research and review mattresses to help you find the perfect night's rest. Our top pick, the Saatva mattress, stands out for its unparalleled comfort, superior support, and durability. Crafted with eco-friendly materials and multiple firmness options, it's the cost-effective choice for your best sleep yet. Discover the magic of Saatva and elevate your sleep experience.



You prefer a simple, non-tech bed

You want an all-foam mattress


You want a mattress that has 50% more gel memory foam than the c2 model

You want dual-sided adjustability for couples

You want a mattress that effortlessly responds to your body and adjusts

The Sleep Number c4 Smart Bed offers personalized comfort and proactive support for a restful sleep. With dual-sided adjustability and a 3" gel-infused comfort layer, this mattress caters to couples with different firmness preferences and provides enhanced cushioning for a balanced feel. Experience the benefits of SleepIQ® tracking and effortless adaptability with the c4 Smart Bed, backed by a 100-night risk-free trial.

Get Sleep Number c4 if...

  • You sleep with a partner. The c4 comes with built-in dual-sided adjustability, so you and your partner can choose your own firmness levels.
  • You need extra support. The c4 comes with a 3" gel-infused comfort layer for enhanced cushioning and resilient, pro-active support.
  • You're a combination sleeper. The c4 has 50% more gel memory foam than the c2 model. This gives it a slightly more plush feel—suitable for all sleeping positions.

Skip Sleep Number c4 if...

  • You want to keep things simple. The c4 model requires the use of either the Sleep IQ® mobile app or Sleep Number remote to control the firmness level. If you aren't particularly tech saavy, this might not be the right choice for you.
  • You want an all-foam mattress. All Sleep Number Classic Series models, including c4, use air chambers at their core to pump more or less air depending on your controlled settings.


  • Has 50% more gel memory foam than the c2 model
  • Dual-sided adjustability, ideal for couples who prefer different firmness levels
  • Effortlessly responds to your body and automatically adjusts accordingly


  • Bed requires assembly
  • A bit pricey, definitely an investment


The c4 Smart Bed is adjustable to your preferred firmness level with Sleep Number settings ranging from 1 (softest) to 100 (firmest).

The c4 model comes with a 3" gel-infused comfort layer for added cushioning and a more balanced feel. The air chambers allow you to adjust the firmness levels to your desired setting (whether that's sink-in soft or no-pushback firm).

Construction Key Points

  • The Sleep Number c4 is 9" tall.
  • Cover - A blend of rayon and polypropylene fabrics with a soft fiberfill material sewn directly into the cover for nice, breathable comfort.
  • Comfort Layer - 3" gel-infused comfort layer provides proactive pressure-relieving support.
  • Air Chambers - Depending on the size, the c4 is built with either single or dual-sided air chambers. The chambers are connected to a 4-foot long pump (hidden within the mattress) that inflates or deflates your mattress based on your specifications.

Support & Motion Isolation

The Sleep Number c4 model has excellent motion isolation due to the two separate air chambers, one on each side of the mattress. Any motion stays on individual sides of the bed.

The c4 contains foam border walls providing superb edge-to-edge support.

Since the air chambers on each side of the bed are individually adjustable, the middle is susceptible to a slight sag if one side is firmer or softer than the other.

Reasons to Buy Sleep Number c4

  1. This is a great choice for people who tend to sleep hot. The Sleep Number c4 Smart Bed keeps quite cool as it's constructed with air rather than a denser memory foam.
  2. If you sleep with a partner, this bed is a perfect solution. The Queen size and up comes with 2 air chambers (one on each side) that allows you and your partner to adjust your side to your personal comfort level.
  3. If you have back problems, the Sleep Number c4 Bed is a perfect match. Being adjustable, the Sleep Number c4 model contours to your lower back and hips based on your preferred firmness level setting. This pressurized support and added cushioning brings ample pain relief where you need it most.

Where can I find a great, affordable mattress (in 2024)?

If you're searching for an affordable mattress that offers a wide range of comfort and pressure relief, we've compiled a list of mattresses for you to consider:

  1. Saatva Mattress - fantastic for all sleep positions, and is rated our Best Mattress of 2024.
  2. Puffy - feels like you're sleeping on a cool cloud (at a good price).
  3. Ghostbed - beautiful, plush cover w/ aerated latex and healthy spinal alignment.
  4. Winkbeds - 3-stage back relief with free shipping and returns.

Read our short, well-researched 10 Best Mattresses of 2024, here. Our ultimate goal is to help you pick your perfect mattress online, today!




What makes Sleep Number c4 unique?

The Sleep Number c4 stands out for its combination of dual-sided adjustability, 50% more gel memory foam for enhanced cushioning, and SleepIQ® tracking technology, providing a personalized and adaptive sleep experience.

How does Sleep Number c4 regulate sleep temperature?

The Sleep Number c4 uses air chambers at its core instead of dense memory foam, allowing for better airflow and temperature regulation throughout the night.

Can Sleep Number c4 help with back pain?

Yes, the Sleep Number c4's adjustable firmness level and added cushioning offer tailored support, contouring to the lower back and hips to alleviate pressure points and potentially relieve back pain.

What is Sleep Number c4's trial period and warranty?

Sleep Number offers a 100-night risk-free trial for the c4 Smart Bed. Additionally, the mattress comes with a limited warranty covering defects in materials or workmanship.

Does Sleep Number offer free delivery?

Sleep Number provides free delivery for their mattresses, including the c4, ensuring a convenient and hassle-free experience for customers.

Is Sleep Number environmentally friendly?

Sleep Number is committed to sustainability and environmental responsibility. While specific details vary, they strive to use eco-friendly materials and implement energy-efficient manufacturing practices.

How does Sleep Number c4's pricing compare to other brands?

The Sleep Number c4 is priced as a premium mattress, reflecting its advanced features and customization options. While it may be more expensive than some other mattresses, it offers personalized comfort and long-lasting durability.

Can Sleep Number mattresses be used with adjustable bases?

Yes, Sleep Number mattresses, including the c4, are compatible with adjustable bases, allowing you to further customize your sleep position and find the most comfortable angle for you.

Is Sleep Number's customer service reliable?

Sleep Number is known for providing reliable customer service. They have a dedicated support team to assist with any inquiries or issues, ensuring a positive customer experience.

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