It magically adjusts to your body temperature, giving you the best night's sleep. 

By Katie Holdefehr
Updated: March 18, 2019
Eight Sleep

While I used to pride myself on my ability to sleep through the night without waking up once, I've recently joined team night sweats (even though I'm many years away from menopause). And while switching out my regular fitted sheet for a breathable linen one helps cool me down when I get overheated in my sleep, it still isn't enough to actually prevent the overheating in the first place. So when I heard that Eight Sleep, the makers of a high-tech, sleep-tracking mattress cover ($460, amazon.com) were launching a brand-new, temperature-regulating mattress, I had to give it a try.

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Called the Pod, this smart mattress monitors your sleep and the bed surface temperature, and then adjusts the temperature so you get the best sleep possible. The promise: no more waking up in the middle of the night to throw off the covers or reach for the extra blanket at the end of the bed. It sounded too good to be true, so I decided to give it a one-night trial. 

After downloading the Eight Sleep app, I saw that I could adjust both sides of the bed on a sliding scale from -10 to 10, with 10 being the warmest. To see how cool it could go, I set it for the max -10 and waited. The Hub, which connects to the mattress, started circulating cool water through the grid inside the mattress. Within half an hour, the mattress was not only cool to the touch, but too cold for my taste (it can get down to an icy 55 degrees Fahrenheit!). The Pod had proven its cooling abilities, but I decided to dial it back, setting it on a comfortably cool -1 setting. 

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Snuggling under the covers, the sheets below felt perfectly chill, like the cool side of the pillow, for the entire blissful hour and a half I set it for. I drifted off to sleep at the perfect temperature and didn't wake up too hot or too cold the entire night. For my one-night trial, I was able to choose one temperature setting and schedule the start and end times, but if you sleep on the Pod night after night, it will track your sleep habits and customize the temperature throughout the night for your best sleep possible. 

Known for its sleep-monitoring mattress cover, of course Sleep Eight also outfitted the Pod with sleep-tracking technology. Within an hour of getting out of bed, my sleep report was ready in the app. In just one night, the Pod knew more about my sleep habits than I did. While I guessed it took me no more than five minutes to fall asleep, the app reported it took 16 minutes. I remembered turning over once or twice during the night, but the app recorded a whopping 17 tosses and turns. I could also see exactly how many hours I slept, plus how long I spent in light, deep, and REM sleep. It even reported my heart rate, respiratory rate, and average bed surface temperature. Tabulating all of these factors, the app gave me an overall sleep score of 66—not the best, but leaving plenty of room for improvement. 

There's a reason Eight Sleep uses the term "sleep fitness"—my sleep score is something to work on and practice by breaking bad sleep habits (the glass of wine I had before bed likely didn​​​​​​'t help) and letting the Pod create the ideal environment. For those who sleep hot (or cold, or want a completely different temperature than their partner), this high-tech mattress is a total game-changer. So long, night sweats.