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Eight Sleep Mattress Review

Founded in 2014 with the goal of being as much a technology company as a mattress retailer, Eight Sleep has shaken up the bed-in-a-box industry with its data-driven approach to sleep. The brand currently features a trio of planetary-named mattresses in its ever-growing line: the Mars, the Jupiter and the Saturn.

Today I’ll be taking a look at the Saturn, putting it through my tried-and-true tests to figure out how it sleeps, how it feels and whether or not it could be the perfect bed for you!

Continue reading below for my full review of the Eight Sleep Saturn mattress. Don’t have time to read it all? Click here to skip to the bottom and check out my review summary.

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Eight Sleep Mattress
Eight Sleep Mattress
Eight Sleep Mattress

This smart mattress is super comfortable, and can be paired with the innovative Eight Sleep tracking technology to ensure the ultimate night’s sleep! Enjoy $50 off your order with our exclusive discount!


The Saturn is built with three layers of responsive foam, measuring up to a total 10” of comfort. In addition to these distinct sections, the bed also features the brand’s proprietary Smart Technology Cover, which tracks users’ sleeping habits to better optimize their shut eye.

It’s not everyday that I get to dig into a bed that combines traditional bed materials with what sounds like pretty fascinating tech, so let’s jump straight into these different layers to see how it all works!

Cover – The cover is made up of 100% polyester, which makes for a thin, soft and stretchy material. There’s not a lot going on here, but the simplicity allows for great breathability and the fabric snaps back into place quickly, so there’s no bunching.

Eight Sleep Cover
Close up of the cover of the Eight Sleep Saturn

Comfort Layer – The comfort layer is comprised of 2” of poly foam. The material is soft, so you’ll be able to sink in for some immediate relief, but also has a quick response to pressure, which means you’re not likely to feel stuck in the mattress. This bounce will help keep you on top of the bed and make it easy to move around the surface.

Transition Layer – Directly below the comfort layer you’ll find another 2” of poly foam. This foam is denser than the one on top, so it’s going to begin providing you with some support and stability as you transition into the base below.

Foundation Layer – Said base is built with 6” of high-density poly foam, a firm material intended to establish the foundation of the bed. It’ll also provide the sleeper with some deep compression support as they sink into the mattress.

Smart Technology Cover – While the Smart Technology Cover doesn’t necessarily affect the feel of the mattress, I wanted to give you a bit more information about it in case it’s something you’re interested in. The cover attaches seamlessly to the structure and is powered by an unobtrusive cord that you plug into the wall. The system tracks movements, regulates temperature and can even wake you up at an optimal time based on your personal sleep cycle. Additionally, you can access all the data it aggregates from your sleep via an app on your smartphone.


After taking a look at the construction of the Saturn, let’s chat about the firmness and feel. I started off by applying light hand pressure to the mattress and was surprised by how firm it was. The combination of poly foam layers creates a ton of bounce, which positions the sleeper on top of the mattress. As I pressed in further, I encountered the dense base, which again propelled me up and out of the structure.

Eight Sleep Hand Press
Pressing into the Eight Sleep Saturn

As I continue to talk about the feel of the Saturn, I want to note that people of different body types and shapes are going to feel firmness differently. For this reason, I enlisted three other people to help me test out the bed’s firmness by lying on the mattress and reporting back their personal firmness ratings to me. I then compiled their responses on the graph below alongside my own.

While feel is always going to be subjective, this will hopefully give you a better sense of the firmness range you can expect from the bed.

Eight Sleep Firmness
Showing the firmness ratings for four testers on the Eight Sleep Saturn

As you can see in the graph above, my testers were pretty much in agreement about the firmness of the Saturn, giving it an average rating of 7.6. When compared to the industry standard of 6.5 for medium firmness, it’s clear that this mattress is pretty firm.

I personally gave the bed an 8 as I found it to be quite a bit firmer than medium firm. I was honestly a bit surprised by this, as you wouldn’t normally expect an all-foam bed to have such little give, but the bounce from the top foam layers coupled with the density of the foundational poly foam makes for an ultra-supportive mattress. That being said, you’re definitely going to feel like you’re sleeping on top of the bed as opposed to in it, which will be great for back and stomach sleepers.


Next up, let’s chat about the pressure you might experience on the Saturn. Instead of merely describing this pressure, I’m going to give you a visual representation of where you might feel pressure points form while sleeping on the bed.

To do this, I placed a pressure map on top of the mattress and lied on my back, side, and stomach. You can see the results on the image below where pressure is represented from blue (low pressure) to red (high pressure).

Eight Sleep Pressure Map
Pressure map results for the Eight Sleep Saturn

Back – Lying on my back, I felt some quality relief from the Saturn. Since it’s a firmer mattress, my hips were raised up nicely and situated in a good alignment with my shoulders. The quick response to pressure of the comfort layer made it easy to move around and switch positions, so I never felt stuck.

Side – While this firmness felt good on my back, I can’t say this comfort translated to my side. The Saturn, billed as the firmest mattress in the Eight Sleep line, didn’t allow for much sinkage, which produced the bright green spots of pressure that you see in the graphic above. If you’re a strict side sleeper, you’ll probably want to consider a softer mattress that produces a bit of body contouring.

Stomach – On my stomach, I didn’t feel too much pressure forming at my chest or hips, which is an important thing for stomach sleepers to take note of. The buoyant support from the foam layers also kept my spine in a great alignment in this position.

Hip and shoulder pain? Check out my top picks for side sleepers.


If you plan on sharing your bed with a partner, you’ll want to know just how much disturbance you’re going to experience as your bed mate tosses and turns in the night. This next test is intended to demonstrate just that, showing the intensity of motion that’s detectable from one side of the bed to the other.

To illustrate this motion transfer, I dropped a 10 lb. steel ball from heights of 4 inches, 8 inches and 12 inches and measured the disturbance it caused: the bigger the lines, the bigger the disturbance.

Eight Sleep Motion Transfer
Motion transfer results showing the disturbance for a 10 lb ball dropped from heights of 4, 8 and 12 inches

These motion transfer results are fairly average and tell me that you’re definitely going to feel your partner moving around at night. While all-foam mattresses are typically pretty good at isolating motion, the bounce of the top foam layers makes even the slightest movement discernible from one side of the Saturn to the other.


Another important factor to consider when making a big mattress purchase is sinkage, or the amount of sinking you’re likely to experience from a bed. To visualize this, I placed four balls of varying sizes and densities (a 6 lb medicine ball, a 10 lb steel ball, a 50 lb medicine ball, and a 100 lb medicine ball) on the mattress and measured how much they compressed the surface.

The variations in size, weight and density are meant to simulate different body parts and different sized sleepers.

Eight Sleep Sinkage
Showing 6 lb, 10 lb, 50 lb and 100 lb balls sinking into the Eight Sleep Saturn
  • 6 lb medicine ball: 1 inch of sinkage.
  • 10 lb steel ball: 2 inches of sinkage.
  • 50 lb medicine ball: 3.5 inches of sinkage.
  • 100 lb medicine ball: 5.5 inches of sinkage.

This is considerably less sinkage than I’d normally expect from an all-foam design, but is consistent with the results I’ve gleaned from the other tests we’ve done thus far. In the Saturn, each foam layer is built to be ultra-supportive, with the aim of lifting the sleeper up and out of the structure. While this will make back and stomach sleepers jump for joy, those in need of something with more cushiony pressure relief will want to look elsewhere.


And finally, edge support, which will be important for those of you who are going to share your bed and need to use the entire surface area of the mattress.

Eight Sleep Edge Support Back
Lying on my back on the Eight Sleep Saturn

Lying on my back near the side of the bed, I felt as supported as I did in the center. Even as I scooted closer to the edge, I continued to feel secure. There was a bit of compression through the top foam layer, but as you can see in the photo, the structure as a whole remained incredibly solid.

Eight Sleep Edge Support Side
On my side on the Eight Sleep Saturn

Rolling onto my side, I continued to experience quality support at the edge of the mattress. You’ll notice in the above image that there was more compression in this position, but it wasn’t major enough to make me feel like I’d fall out of the bed.

Eight Sleep Edge Support Seated
Sitting on the edge of the Eight Sleep Saturn

In this position, I wanted to simulate what it would feel like to be sitting on the bed in the morning getting ready for the day. A lot of foam mattresses experience severe compression in this position, but the Saturn actually held up fairly well.


Eight Sleep Corner
Corner view of the Eight Sleep Saturn
  • Sleep Trial: 100 days.
  • Warranty: 10 years.
  • Shipping: Free, arrives compressed in a box.

Just getting started? Begin your mattress search with my mattress reviews breakdown.


If you’re convinced the Saturn is the right mattress for you, the size and pricing information for the mattress are below. Please note that these prices reflect standard pricing, but you can save $50 with the code SLEEPOPOLIS.

Full54" x 75" x 10"$699
Queen60" x 80" x 10"$799
King76" x 80" x 10"$949
Cali King72" x 84" x 10"$949


Eight Sleep Front
Front view of the Eight Sleep Saturn

Now that we’ve taken a closer look at the Saturn mattress, it’s time to discuss who it’d be a good fit for.

  • Bounce – If you’re in the market for a mattress with great bounce, look no further than the Eight Sleep Saturn. This bed features a ton of lift in its top foam layers, which helps to keep the sleeper on top of the mattress.
  • Back and Stomach Sleepers – As we discussed throughout the review, this is a pretty firm bed, so could be a fantastic pick for back and stomach sleepers who benefit most from firm support.
  • Interested In Sleep Tech – The Saturn would also make a good mattress for anyone interested in sleep technology. The bed’s Smart Technology Cover tracks sleep patterns and helps to improve users’ sleep health in real time.

For more information on the Eight Sleep Saturn, check it out here!

Smart & Supportive
  • Materials
  • Comfort
  • Support
  • Value
  • Cooling
  • Edge Support
  • Sex
  • Smell
  • Company
  • Refunds
  • Trial
  • Warranty


The Eight Sleep mattress is comfortable, supportive, responsive, and an overall good value. Yet, the Eight Sleep technology is what really puts this mattress in more of a unique space. By adding the sleep tracking technology, designed by Eight Sleep, to the mattress, sleepers are able to receive their sleep data and trends. This information works to help sleepers improve their sleep while also sending data back to Eight Sleep so they are able to make necessary changes to their mattress and technology. There are a few other features tied into the sleep tracking system, so if you’re interested in improving sleep and testing out the newest sleep tracker on the market, Eight Sleep is a fine option.

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Logan Block
Logan is the content director of Sleepopolis, which means he not only reviews new mattresses every week, but also curates all the comparisons, best of pages, and video guides on the site. He takes a straightforward, honest approach to his reviews and endeavors to give viewers an objective look at each new product he tries out. Logan has perfected his method by personally testing over 200 different mattresses, so he’s not only able to discern the overall vibe of a specific bed, but to contextualize its feel within the bed-in-a-box market as a whole. When he’s not hopping on a new bed or working with our editorial team to whip up an engaging sleep education guide, you can find him reading books on world history, walking his dog Pepper, or searching for the best cheeseburger in New York City.
Logan Block

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