--- product_id: 24770569 title: "Under Mattress Sleep Tracker with HRV" brand: "emfit qs" price: "€ 13.13" currency: EUR in_stock: false reviews_count: 3 url: https://www.desertcart.at/products/24770569-under-mattress-sleep-tracker-with-hrv store_origin: AT region: Austria --- # Tracks sleep cycles Clinically validated data Ultra-thin sensor Under Mattress Sleep Tracker with HRV **Brand:** emfit qs **Price:** € 13.13 **Availability:** ❌ Out of Stock ## Summary > Sleep Smarter, Live Better! 🌟 ## Quick Answers - **What is this?** Under Mattress Sleep Tracker with HRV by emfit qs - **How much does it cost?** € 13.13 with free shipping - **Is it available?** Currently out of stock - **Where can I buy it?** [www.desertcart.at](https://www.desertcart.at/products/24770569-under-mattress-sleep-tracker-with-hrv) ## Best For - emfit qs enthusiasts ## Why This Product - Trusted emfit qs brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - β€’ **Effortless Setup:** Just slip it under your mattress and let it do the work. - β€’ **Real-Time Insights:** Access your sleep data anytime, anywhere. - β€’ **Precision Monitoring:** Get accurate metrics on heart rate and sleep quality. - β€’ **Transform Your Sleep:** Unlock the secrets to better rest and recovery. - β€’ **Athlete's Best Friend:** The ultimate tool for performance-driven individuals. ## Overview The Under Mattress Sleep Tracker with HRV is a revolutionary contact-free health monitor designed to provide detailed insights into your sleep quality and recovery. With its ultra-thin sensor that slips effortlessly under your mattress, it tracks vital metrics such as heart rate, breathing rate, and sleep cycles, all while being clinically validated for accuracy. Perfect for athletes and health-conscious individuals, this device empowers you to make informed decisions for optimal performance and well-being. ## Description Full description not available ## Features - SLEEP BETTER AND STAY HEALTHIER – What you measure you can manage better, same goes with sleep and recovery. Better sleep means huge benefits where you’ll stay healthier, reduce stress, maintain healthy body weight, and lower the risk of health problems. - PERFORM AT YOUR BEST - Emfit QS gives you a detailed description of your sleep quality and progression of recovery. Armed with this information will enable you to make well-educated choices for daily workouts, meetings and other important events. - PREFERRED CHOICE FOR ATHLETES - The only contact-free health and sleep monitor that can provide whole night HRV for recovery and readiness analysis. The best for athletes along with people who like to follow their daily load and nightly recovery. - EASY TO SETUP AND USE – Nothing to wear and no need to turn the device on and off. Just slip the ultra-thin sensor under your mattress. Emfit QS automatically starts measuring, and data will be available for deep insight from any device with browser. - ACCURATE - Measures heart and breathing rate (highly accurate, clinically validated), heart rate variability, sleep cycle, movement activity, time in sleep and in bed. Data is available in the web application with any pc, tablet or mobile device browser. ## Product Details - **Brand:** Emfit QS - **Material:** Plastic, Silicone - **Compatible Devices:** Smartphones - **Screen Size:** 0.96 Inches - **Sensor Type:** Contact-free - **Battery Description:** No Battery - **Global Trade Identification Number:** 06430029140717 - **Manufacturer:** Emfit ## Images ![Under Mattress Sleep Tracker with HRV - Image 1](https://m.media-amazon.com/images/I/71iBqiQcD6L.jpg) ![Under Mattress Sleep Tracker with HRV - Image 2](https://m.media-amazon.com/images/I/71rBIn9fhxL.jpg) ![Under Mattress Sleep Tracker with HRV - Image 3](https://m.media-amazon.com/images/I/81HqSgP+-hL.jpg) ![Under Mattress Sleep Tracker with HRV - Image 4](https://m.media-amazon.com/images/I/81n7QgnJVAL.jpg) ![Under Mattress Sleep Tracker with HRV - Image 5](https://m.media-amazon.com/images/I/71fNyns497L.jpg) ## Questions & Answers **Q: Does this work for 2 people in bed and track each side independently** A: no, just one person on one side of the bed **Q: Will this work with a Sleep Number bed?** A: Yes definitely. I am using a sleep number bed now. I tried the belt two ways, under the mattress and on top of it, but under the mattress pad. It’s more sensitive to movement on top of the mattress. That’s my preferred mode. Buts it’s equally sensitive to all the other metrics in either location. Rich S. **Q: My dog sometimes sleeps on my bed, will it throw off the data?** A: No, it won't. **Q: Increasing medical studies recommend naps for memory & recovery. Does this track naps?** A: It can be set up to track or ignore naps. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Effective, Non-evasive Sleep Tracker *by B***N on February 27, 2019* I purchased the Emfit QS in January 2018 and have spent the last year sleeping with it. First, it is non-evasive. You don't have to put anything on your body, turn anything on or start/stop anything before and after sleeping. You simply lay in bed, it senses your presence, begins recording and uploads your data during the night to the Emfit servers. When you exit bed in the morning it recognizes it and begins to put together a picture of your night of sleep. By the time I have my coffee made, I can jump on my phone or look at my computer and get all the data. And there is a ton of data it provides: sleep time/score, breakdown of light/deep/REM cycles, HRV w/ nervous system balance, avg and resting heart rate, respiratory rate, movement/restlessness and finally a proprietary recovery score (that probably still needs some work).The next question people ask is: are the metrics accurate? I also wear an Oura Ring 24/7. It, like the Emfit QS, tracks all the metrics mentioned above. When comparing the results of the two devices, while not matching exactly, show a very clear correlation. They are identical in the sense that when one shows a lower HRV or high HR, the other device has recorded the same trend. Then you have to look at the results provided by the QS and compare it to what you think should be happening, I've found they gel. For example, I was in a bad bike vs car accident in April 2018 that knocked me out of triathlon training for about 5 months while I recovered. During that period the Emfit recorded much high HRV values while recording high resting heart rate values as I lost fitness and aerobic conditioning. Weeks after returning to training, HRV numbers began to drop while my resting HR lowered as well.I have tried several different sleep trackers and HRV/HR measuring tools. This and my Oura Ring are 1 and 1a on the list of effective devices. If you are looking for a hands-off biohacking/recovery measuring/sleep tracking tool I would highly recommend this.Let me cover some of the negatives. I had, and others have reported, some connection issues with their home WiFi. I did find it quirky when I first set it up and had difficulty getting it to connect. Once connected though, I have had no drops and there has not been a single night that data was not recorded. Next, there is no option to place it in airplane mode. There is no internal memory to record during the night and then upload the data later. The device it constantly reaching out to your WiFi every six seconds and uploading data while you sleep. For some concerned about having a WiFi signal that close to you every night, this may not be the device for you. Having said that, the Emfit QS does come with a long power cord and a transmitting device that you can place up to six feet from your bed. Nevertheless, a semi-easy update to this device would be a 2.0 model with internal memory that can turns itself off, record your data all night and then turn on and upload the recorded data once you out of bed. Lastly, if you spend a lot of time in your bed, say watching TV or reading before you sleep, the device night confuse it with you attempting to fall asleep unsuccessfully. I read for at least 30 minutes before I turn the lights off. I found that if I just get out of bed to check if the doors are locked after reading, the device recognizes my sleep patterns enough that it does not record the extra time.A couple of other side notes. I have a Tuff N Needle memory foam mattress. It provides no difficulty in getting any bio-metric signals through it. It also does not pick up my wife's signals when she sleeps, even if we are up against each other.Overall it has proved to be a solid device that provides good, valid sleep and recovery data. ### ⭐⭐⭐⭐ I would recommend, with caution *by A***R on March 10, 2018* I would recommend, with caution. I bought this after reading a lot of reviews and determining this was the most accurate sleep monitor. My thinking was, If you can't trust the accuracy of a monitor, the data is going to be useless to you. I bought it for my sleep problems. I am not an athlete so I didn't use the heart rate variability data etc.Setup was super simple. I was able to connect it to WiFi simply by pressing the button on my router, then using a paper clip on the Emfit QS. My sleep info gets sent to the internet automatically and reliably and it is always there in my browser when I wake up. The only problem I had with setup was I have a very thick mattress with no box so I basically had to slice my mattress open and put the sensor in under the mattress pad.It gives you a lot of information, from which you can piece together how you're sleeping. However, as I found, you cannot rely 100% on the total sleep and sleep stage classification. The accuracy of these numbers is questionable. For instance, my child was lying in my bed reading for 2 hours and apparently not only did he get 1.5 hours sleep, but he got 1/2 hour of REM sleep! Pretty good for being awake!Having said that, I have reason to believe the toss & turn data is accurate since the sensor for this is pretty basic so you can use this data to clearly figure out when no sleep is happening and do the math to figure out your total sleep. So in order to keep track of my sleep I need to analyze the data, add up the numbers, and keep a separate spreadsheet. Not everybody's willing to do this, but it works for me (so far).I am planning to buy a Fitbit Alta HR so I can compare results. ### ⭐⭐⭐⭐⭐ Wonderful device, lots of data - but not for everyone *by R***L on May 15, 2020* The Emfit QS is amazing in two ways. One is the amount of data it provides. The other is how it works -- that it can pick up your heart's movement through even a thick mattress! Sure, it's not as accurate as connecting probes to your body, but it seems to as accurate as or better than the less convenient optical arm bands or ring.But it isn't for everyone. Though a sleep "score" is provided, you don't get the full value unless you are willing to invest in interpreting the data.The other issue is that it's become clear that Emfit is a "small" company with a niche (i.e. small) customer base. Very friendly people on the phone, but don't expect a 24x7 team operations team behind the cloud service. I had the misfortune of receiving my unit on a day their servers were down and spent quite a bit of time wondering whether I did something wrong or received a defective unit. Eventually, we concluded that everything is set up correctly and should be working -- but had to wait until morning in Finland for the HQ team to check on the server. Sure enough, things came alive at what looked to be 6'ish AM UTC. So, you need to be willing to deal with a small team of dedicated scientists, etc., instead of a large scale mainstream consumer company. ## Frequently Bought Together - Emfit QS HRV Sleep Monitor - White - Amazon Basics Whiteboard Drywipe Magnetic with Pen Tray and Aluminium Trim, 240 cm x 120 cm (WxH) --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.at/products/24770569-under-mattress-sleep-tracker-with-hrv](https://www.desertcart.at/products/24770569-under-mattress-sleep-tracker-with-hrv) --- *Product available on Desertcart Austria* *Store origin: AT* *Last updated: 2026-04-23*