Eight Sleep Saturn+ Mattress Review

Eight Sleep makes a variety of sleep accessories and mattresses, including The Saturn+, an all-foam “smart” mattress with many features that can be controlled from your phone.

The Saturn+ is constructed in three layers: 6 inches of supportive base foam, 2 inches of transition polyfoam, and 2 inches of responsive polyfoam. The “Smart cover” features sensors which connect to your phone to track and control a variety of functions. The mattress is available in one firmness setting in standard sizes from full to California king, each 10 inches in height.


In-depth Eight Sleep Saturn+ Mattress Review

Eight Sleep Saturn+ Mattress Sizing and Pricing
Full54” x 75” x 10”$699
Queen60” x 80” x 10”$799
King76” x 80” x 10”$949
California king72” x 84 x 10”$949
King76” x 80” x 10”$700
California King72” x 84 x 10”$700

The Saturn+ is available in one firmness setting, which rates betwen a 6-7 on the firmness scale. The scale runs from 1-10, with 1 being the least firm and 10 being the most firm. The Saturn+ is considered a medium firm. That’s usually a safe place for most customers to begin. If you know you prefer a very soft or plush feel, this bed might not be the right fit for you.


The Saturn+ is available on Sleep Eight’s website. The company also operates a brick and mortar showroom in New York City, where customers can try out the bed.


Three layers make up the Saturn+. The support core is 6 inches of 1.8 PCF (pounds per cubic foot) support foam. The following layer is 2 inches of 1.8 PCF transition foam. The top comfort layer is 2 inches of 3 PCF polyfoam. The mattress’ “smart cover” contains the technology that connects to an app on your phone to track sleep, heart rate, and respiratory rate. It also monitors the bed’s temperature, which can be regulated from the app as well. The technology can also sink with your smart home device, to do things like turn on your lights or start your coffee pot.


After a Saturn+ is ordered, it is compressed, sealed in plastic, and delivered to your door in a marked box. The smart cover ships in a separate box. The bed arrives in one piece, but you will need to put the smart cover over the mattress.

Shipping is available to the contiguous 48 states free of charge. Deliveries to Alaska, Hawaii, or international locations is not available at this time.

The Saturn+ is typically delivered within 10 business days of ordering.

Additional Services

White glove delivery service is available. For an additional $75, Eight Sleep will arrange in-home delivery and removal of all packaging. For an additional $50 ($125 total), they will also arrange to remove an old mattress from the home.

Sleep Trial

Eight Sleep offers a 100-night sleep trial on the Saturn+. The company does require that you keep the mattress for at least 30 days before initiating a return. If at any time between 30-100 nights you are not satisfied, you can return the mattress, the smart cover, or both, for a full refund of your purchase price. Any delivery fees are non-refundable.


The Saturn+ is covered by Eight Sleep’s 10-year warranty. During that time, the company will pay to repair or replace a defective mattress. Note that warranty does not include the smart cover or sleep tracking technology. The smart cover carries a 2-year warranty and the sleep tracker is covered by a 1-year warranty. Full details can be found here.

Eight Sleep Saturn+ Mattress Performance

Motion Isolation

Foam mattresses tend to isolate motion quite well. The foam “traps” the motion, keeping it from transferring across the bed. As expected with its construction, the Saturn+ performs well in this category.

Edge Support

On the other hand, foam mattresses don’t do so well when it comes to edge support. Because the perimeter is not reinforced, it often tends to sag and sink – especially if there’s a certain spot where you normally sit on the edge of the bed. Saturn+ customers report that this is indeed a problem with this bed as well.

Heat Retention

The foam layers on the Saturn+ don’t have the same give and “sink” of memory foam, so they don’t trap as much body heat. In addition, the bed’s technology allows sleepers to have control over bed temperature.


“Off-gassing” is the smell that results when a compressed and sealed mattress is first removed from its packaging. This odor is temporary and usually doesn’t last more than a day or two. You should expect this smell from the Saturn+, but it won’t last long.


The support in the Saturn+ comes from its combination of foam layers. The bed’s comfort layer is only 2 inches thick, which does give us some pause. We usually look for comfort layer that are at least 3 inches thick. The Saturn+ might be fine for some, but heavier sleepers or those who sleep on their side might not find enough support with this bed.


The Saturn+’s foam layers react to pressure and heat to conform to each sleeper. Without traditional memory foam, the bed doesn’t provide a tight “hug.” The polyfoam layers still work, however, to alleviate pain and pressure points.


The foams used in the Saturn+ are not as dense as we would typically like to see when considering durability. It’s also important to remember that the bed’s technology will likely not last as long as the mattress itself.


Couples sometimes find that foam beds lack responsiveness and make it difficult to easily move on the bed. This could restrict sexual activity. Couples who are worried about this might consider a hybrid or innerspring mattress that has more bounce.

How Do Customers Rate the Saturn+?
Google ShoppingNot applicable
Consumer ReportsNot applicable
AmazonNot applicable

What Type of Sleeper Is Well Suited to an Eight Sleep Saturn+ Mattress?

When buying a new bed, it’s important to remember that this decision is a very personal one. You should consider your own preferences, sleeping position, body weight and type, as well as any health conditions you may have. Also consider your own comfort and support needs. You should also take advantage of any sleep trial to make sure your new bed is the right fit for you.

With that in mind, consider this subjective customer feedback for the Saturn+ mattress:

Looking at the chart below, you see that sleepers who are below average weight (those who weight under 130 lbs) rate the Saturn+ quite well. Sleepers of an average weight (those weighing between 130-230 lbs) also seem quite happy with the bed. Side and back sleepers rate it “very good.” Those sleepers are above an average weight (those who weigh more than 230 lbs.) don’t rate the bed quite as highly. As we mentioned, heavier sleepers might find the bed’s comfort layer to be too thin.

Below Average Weight (under 130 lbs)Average Weight (130-230 lbs)Above Average Weight (above 230 lbs)
Side SleepersGoodVery goodFair
Back SleepersVery goodVery goodGood
Stomach SleepersGoodFairFair

Company Information

Customer Service: We don’t have enough customer data to report on Sleep Eight’s service at this time.

Reputation: Eight Sleep is still establishing its reputation among customers.

BBB Rating: A+

Years in Business: The brand Morphy, Inc. launched in 2014 before changing its name to Eight Sleep in 2015. The sleep tracker was previously sold under the name ‘Luna Sleep.’

Corporate Headquarters: 25 W 26th Street, 3rd Floor  New York, NY  10010

Physical Stores: Sleep Eight operates one brick and mortar showroom in New York City.

Phone Number:  1-888-848-9085

Contact Email: [email protected]

Our Verdict

Eight Sleep’s Saturn+ is an all-foam bed that features smart technology. With its smart cover linked to your phone, you are able to track sleep, heart rate, and respiration. In addition, you can link to your smart home device to control even more features of your sleep experience.

The bed is available in one firmness setting, in standard sizes from full through California king. The foam bed does a solid job isolating motion and it conforms well to alleviate pressure points and pain.

Here’s how we rate the Eight Sleep Saturn+ mattress on a scale of 1 (worst) to 10 (best):

Material Quality
7.7 / 10
8.0 / 10
Temperature Regulation
10.0 / 10
8.3 / 10
Suitability for Sex
7.8 / 10
Trial period
8.5 / 10
8.5 / 10
Company Reputation
8.0 / 10
Value for the Money
7.7 / 10


- Eight Sleep has added innovative sleep tracking technology across their product line
- Good support layers should keep your spine aligned
- Minimal noise and no motion across the surface of the mattress
- Free shipping


- Limited track record means we can't be sure of the long-term durability of these beds
- Similarly, the smart sleep technology has not been around long enough to understand flaws