We’re testing a temperature-regulating mattress that claims to boost recovery


The Eight Sleep is a smart, app-controlled mattress pad with body tracking and a sleep coach app. The Pod Pro blanket monitors your sleep and other health metrics, translating these stats into a Sleep Fitness Score. Eight Sleep’s Pod Pro Max mattress is designed with six optimal layers, but you can simply slip the cover over your own to benefit from the same technology. The AI ​​engine will adjust your bed temperature to your body’s rhythms and improve your sleep quality. Of course, better sleep means improved mental and physical performance the next day.


Eight Sleep has famous fans. These include CrossFit athlete Justin Medeiros, the 2021 and 2022 CrossFit Games champion; the Mercedes-AMG Petronas Formula 1 team, including seven-time world champion Lewis Hamilton; and now me.


Sleep trackers often focus on how much time we spend in REM or deep sleep stages, missing the fundamental fact that more than two-thirds of Britons miss seven hours a night. Reduced sleep hampers our ability to follow these natural cycles, which is why the Eight Sleep app encourages the creation of consistent habits. Generally, we need cooler temperatures for deep sleep than for REM. The heating and cooling autopilot aims to support our natural rhythms, providing longer and better quality sleep.


I spent a month kipping on the Eight Sleep, while tracking my sleep with a WHOOP 4.0, to compare the results of each. Every morning I noted, subjectively, how well he had slept and how energized I felt.


The mattress starts to cool an hour before your normal bedtime and the first night I slipped into the noticeably cold sheets was a joy. I run extremely hot, as many men probably do. My wife, of course, is the opposite. It’s a dilemma as old as the world, it seems. Being able to set each side of the Eight Sleep to different temperature paths solves this problem, allowing my side to be so cold at times that my kidneys felt partially frozen, while my wife oscillated between ‘hot’ and ‘lukewarm’ . The dream, in other words.

My sleep has definitely increased over the month. In fact, the boost to my REM (deep) stage was almost instantaneous. Especially for me, I woke up less at night, logging 30-45 minutes of extra sleep per night. That doesn’t seem like a lot, but it has made a difference, as evidenced by an upward tick in my daily HRV readings, both on my WHOOP app and on Eight Sleep’s own HRV tracker. Eight Sleep always had me at a higher level of HRV than I got used to with WHOOP, but they were still consistent with each other.

Sleep heat rate was also down, as you would imagine being kept in ice like Captain America. But the benefits for my post-workout recovery were palpable. We all know we should be moving around, eating cleaner, hydrating better, meditating more, and sitting in ice baths regularly. But only a few of us have the time, the means or the determination to do so, and even fewer everything, of those he calls less pain. But you sleep every night, and the Eight Sleep Mattress Pad optimized that latent recovery time for me. Despite starting a new, heavier training regimen, I suffered less from DOMS and felt more energized, which gave me a better chance of doing well in the 90 minutes I spend in the gym. , as well as parenthood, work, and the husband that fill all other moments. of my day.

With prices starting at £1,795 for a standard UK double, it’s not the cheapest tool. But when you start breaking that down into price per night over a year, it improves the reading. It’s still not a magic bullet, of course. Go to bed too late and you won’t get as much benefit the next day. Too much craft beer – as I usually do – and your recovery will suffer. Anyone who has tracked their sleep with a device or app will know this. If you are able to go to bed and wake up around the same time most of the time, you will see improvements, and fast.


The mattress pad has two separate zones, so you and your partner can set the heating and cooling system, as well as the vibrating wake-up alarm, to your own preferences. Crucial things, especially if you have to wake up at different times.

The automatic temperature control was excellent 99% of the time. But an occasional cold snap during the night can be a shock if you wake up at the wrong time. You get used to it, watch out.

The installation was quite… comprehensive. You have to refill the hub if the water level gets too low, and it’s bulky – about the size of an old-fashioned PC tower – and can be a bit noisy. If you sleep well with a fan on, you shouldn’t worry too much about it.

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