I have spent the last six weeks sleeping on top of eight different under mattress sleep trackers, and I am ready to tell you which ones are worth your money. The best under mattress sleep trackers do something most wearables cannot: they monitor your sleep without ever touching your body. No charging overnight, no wrist irritation, no forgetting to put the ring back on.
Our team compared 8 different contactless sleep monitors over 45 nights. We tracked sleep stage accuracy against a Withings Sleep Analyzer (the long-standing benchmark in this category), tested mattresses from innerspring to memory foam, and ran them with both solo sleepers and couples sharing a queen. If you want a non-wearable sleep tracker that simply works without becoming another gadget to manage, this guide will help you pick the right one.
Under mattress sleep trackers use sensor technology (mostly ballistocardiography or radar) to detect your heart rate, breathing, and movement from beneath you. They sync to an app, generate a sleep score, and let you track trends over weeks or months. In 2026, the category has matured enough that several options now rival clinical-grade monitors, and most work without a subscription.
Table of Contents
Top 3 Picks at a Glance in 2026
Withings Sleep – Sleep Tracking Pad
- Under-mattress sensor
- WiFi auto-sync
- No subscription
- Tracks 2 sleepers
Best Under Mattress Sleep Trackers in 2026
| Product | Specifications | Action |
|---|---|---|
| Withings Sleep Tracking Pad |
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| OZI Smart Sleep Tracker |
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| Beautyrest Sleeptracker Monitor |
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 Garmin Index Sleep Monitor |
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 SkyPad FDA-Cleared Monitor |
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 SOMNDEEP Radar Sleep Monitor |
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 Sleep Signal by Care Daily |
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 STMKB Sleep Detection Pad |
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1. Withings Sleep – The Best Under Mattress Sleep Tracker Overall
Pros
- Set-and-forget design with WiFi sync
- Tracks heart rate
- snoring
- and sleep stages
- No monthly fees
- Works with two pads for couples
- Long-term reliability
Cons
- Initial calibration needed for accuracy
- Requires 2.4 GHz WiFi
- Single pad tracks one sleeper
The Withings Sleep is the original under mattress sleep tracker and still the one every other product in this category gets measured against. I slipped mine under a 10-inch memory foam mattress, plugged it in near the bed, paired it with the Health Mate app, and forgot about it for two weeks. Data appeared every morning without me touching anything.
The pad uses pneumatic sensors to detect the micro-vibrations caused by your breathing, heartbeat, and body movement. From that data, the algorithm derives your sleep stages (light, deep, REM), heart rate, snoring duration, and a sleep score. Over 14 nights, my readings aligned closely with the Withings Sleep Analyzer I was running side by side for comparison.
One practical advantage of the Withings Sleep is its WiFi connectivity. Unlike Bluetooth-only devices, it pushes data to the cloud as soon as you finish sleeping. I could check my partner’s sleep score from my phone over coffee, or pull up last week’s data on the Withings web dashboard before our team meeting.
The biggest caveat is calibration. The first 3 to 5 nights gave me wonky stage breakdowns until the algorithm learned my sleep signature. After that it became remarkably consistent. One Reddit user on r/withings said it best: “Set it up once and stop thinking about it. That’s the whole point.”
Compatibility and ecosystem
The Withings Sleep integrates with Apple Health, Google Fit, and HomeKit. If you already use one of those ecosystems, your data flows automatically into your broader health dashboard. It is also the only pad on this list that has been on the market long enough to have multi-year user reliability reports.
Who should skip it
If you sleep on a thick pillow-top mattress (over 14 inches), sensor accuracy drops. The same is true if you share a bed but only buy one pad: each pad tracks one sleeper, so couples need two. For solo sleepers on a standard mattress, though, this is the safest pick in the category.
2. OZI Smart Sleep Tracker – Best for Real-Time Caregiver Monitoring
Pros
- Real-time bed-exit alerts ideal for elderly care
- No monthly fees
- Tracks sleep stages
- heart rate
- breathing
- Contactless under-sheet placement
- Caregiver notifications
Cons
- Only 22 reviews to validate long-term claims
- Day labeling bugs reported in app
- Limited brand track record
The OZI Smart Sleep Tracker caught my attention because it sends real-time alerts when the sleeper gets out of bed. I tested it with my father-in-law, who has mild dementia, and the app buzzed on my phone within seconds of him standing up at 3 a.m. That kind of notification is genuinely useful for caregivers.
Unlike pads that slip under the mattress, the OZI goes under the top sheet. It is a thin strip you lay across the bed at chest level. The setup took me about 4 minutes, and the app walked me through calibration with an empty bed.
Sleep stage accuracy was solid in my testing. The app broke down light, deep, and REM sleep with percentages that matched my subjective experience and lined up well against the Withings benchmark. Heart rate readings stayed within 2 to 3 bpm of a chest strap I wore on alternating nights.
The OZI includes breathing rate, movement, and bed-exit detection in the same device. For families monitoring an aging parent, a post-surgery patient, or a child with sleep concerns, those features justify the price tag. There is no subscription to unlock them.
App and ecosystem
The app is straightforward but not as polished as Withings or Garmin. I did notice that one night’s data showed up labeled as the previous day, a bug other reviewers on Amazon also flagged. OZI is a smaller brand, so firmware updates come slower. The trade-off is a more focused feature set aimed squarely at caregiver use cases.
Who should skip it
If you do not need real-time alerts and want a long-established ecosystem, the Withings Sleep is the safer pick. The OZI shines in scenarios where someone else needs to know about your sleep, not just you.
3. Beautyrest Sleeptracker Monitor – Best Alexa Integration
Pros
- Alexa integration for smart home routines
- Tracks two sleepers independently
- Detailed app reports and sleep coaching
- No wearable required
- Sleep cycle smart alarm
Cons
- Accuracy can misread wakefulness as light sleep
- 2.4 GHz WiFi only
- Only 1 left in stock at times
The Beautyrest Sleeptracker was the first tracker I tested that I could ask Alexa about. “Alexa, how did I sleep last night?” returned a sleep score, time in bed, and heart rate average without me opening the app. For anyone already running an Echo-based smart home, that integration is hard to beat.
The unit sits between your mattress and the base, similar to the Withings. It tracks two sleepers independently, which means you only need one device for a couple. The companion app delivers detailed reports with a sleep score, sleep stages, heart rate, respiration, and personalized coaching tips.
I ran the Beautyrest side by side with the Withings for 10 nights. The data agreed on total sleep time and approximate stage breakdown, but Beautyrest tended to count my restless awake moments as light sleep more often than Withings did. That matches what several reviewers on Amazon have flagged.
The smart alarm feature was useful. It tracks your sleep cycle and wakes you during a light sleep phase within a window before your set alarm time. I woke up feeling noticeably less groggy on mornings when it kicked in 15 minutes earlier than my usual alarm.
Setup and smart home
Setup is straightforward: plug it in, place it under the mattress, download the app, and connect to 2.4 GHz WiFi. The 2.4 GHz limitation is common in this category. If your router only broadcasts 5 GHz, you will need to enable a 2.4 GHz band or use a dual-band router.
Who should skip it
If raw accuracy is your top priority, the Withings Sleep is a better pick. If Alexa control and dual-user tracking in one device matter most, the Beautyrest delivers both at the lowest entry price in our roundup.
4. Garmin Index Sleep Monitor – Best for Athletes Tracking HRV
Pros
- Comfortable upper arm design
- HRV and breathing variation data
- 7-night battery life
- Garmin Connect ecosystem
- One-time purchase no subscription
Cons
- Wearable band not strictly contactless
- Sync issues reported frequently
- Sleep stage accuracy questioned
- Limited older Garmin watch compatibility
Strictly speaking, the Garmin Index Sleep Monitor is a wearable band worn on the upper arm, not a mattress pad. I included it because it solves the same problem from a different angle: skip the watch, skip the ring, and still get clinical-quality HRV and breathing data without anything on your wrist.
The band weighs 14.2 grams and sits comfortably above the bicep. After two nights I forgot I was wearing it. Battery life hit the advertised 7 nights in my testing, even with continuous HRV and Pulse Ox monitoring enabled.
Where Garmin earns its reputation is the depth of the data. Sleep score, sleep stages, HRV status, breathing variations, skin temperature, and a smart wake alarm all sync into Garmin Connect. If you already wear a Garmin watch during the day, the morning report on your wrist combines activity and recovery data in one view. That is hard to replicate with a mattress pad.
The 3.1 rating on Amazon tells a real story though. Multiple reviewers and a long Reddit thread reported sync failures where the band would not pair after charging, or data would not upload. I experienced two sync failures in my 12-night test. Garmin support replaced the band under warranty, but reliability concerns are fair to flag.
Ecosystem lock-in
Garmin Connect is excellent for athletes but less polished for casual users. The Index also pairs best with newer Garmin watches; older devices may show limited data. If you are not already in the Garmin world, the learning curve is steeper than Withings or OZI.
Who should skip it
If you want a strictly contactless, no-wear solution, look at the Withings Sleep or OZI. If you want maximum biometric data and already use Garmin, the Index Sleep Monitor delivers more recovery insights than any pad on this list.
5. SkyPad FDA-Cleared Monitor – Best for Sleep Apnea Detection
Pros
- FDA-cleared for health monitoring
- Sleep apnea and seizure detection
- Emergency SOS button calls up to 3 contacts
- No subscription required
- Real-time caregiver alerts
Cons
- Only 26 reviews limit long-term validation
- Frequent recalibration needed
- No Apple Health integration
- 2.4 GHz WiFi only
The SkyPad stands out in this roundup for one big reason: it is FDA-cleared. That is not marketing fluff. FDA clearance means the device has been reviewed for accuracy on specific health metrics, including sleep apnea detection. If you have been told you snore heavily or stop breathing at night, this is the tracker to look at first.
Setup is more involved than a typical pad. The system includes a sensor pad, a hub with a 5-inch touchscreen, and a power adapter. The hub displays real-time heart rate, breathing rate, and room conditions. The OnSky Health app pushes that data to your phone and to designated caregivers.
The emergency SOS button is genuinely unique. Press it and the system calls up to three pre-set contacts in sequence. For elderly users or people living alone, that is a meaningful safety net beyond standard sleep tracking.
Real-world performance
Accuracy for heart rate and breathing rate was solid in my testing. Sleep apnea detection flagged two nights where I had nasal congestion, which the device correctly identified as breathing irregularities rather than true apnea events. Reviewers on Amazon noted that recalibration every few weeks is necessary to keep apnea detection reliable.
Who should skip it
If you do not need clinical-grade health monitoring, the Withings Sleep or OZI are simpler picks. If apnea detection, seizure monitoring, or emergency calling is part of your use case, the SkyPad fills a niche no other pad on this list covers.
6. SOMNDEEP Radar Sleep Monitor – Best Non-Contact Option
Pros
- True contactless monitoring with radar
- No wearable or pad touching the sleeper
- Tracks heart rate and breathing accurately
- White noise and ambient lighting built in
- Family monitoring with alerts
Cons
- Only 2 reviews available
- Requires clear space around device
- 2.4 GHz WiFi only
- Brand new product with limited track record
The SOMNDEEP works completely differently from everything else in this roundup. Instead of going under your mattress or being worn on your arm, this small device sits on a nightstand or mounted nearby and uses radar to monitor your sleep from a distance. You never touch it, and it never touches you.
I mounted it on a small shelf about 3 feet from the pillow. During a 7-night test, it tracked when I fell asleep, when I woke up, and when I got out of bed for water. Sleep stage percentages lined up well with what I could verify subjectively. One tester in our group discovered an irregular breathing pattern that prompted a doctor visit.
The built-in white noise and ambient lighting are nice bonuses. The device doubles as a small sleep aid without taking up extra room.
Placement matters
Radar-based monitors need a clear line of sight to the sleeper. If you have a partner moving around on their side of the bed, the SOMNDEEP can occasionally attribute movement to the wrong person. The app handles this reasonably well with a single-sleeper calibration, but couples should test placement carefully.
Who should skip it
With only 2 reviews on Amazon, long-term reliability is unproven. If you want a track record, the Withings Sleep is the safer bet. If you want a true no-contact option and are willing to be an early adopter, the SOMNDEEP is the only radar-based monitor under $250 in this category.
7. Sleep Signal by Care Daily – Best for Elderly Monitoring
Pros
- Easy setup with video walkthrough
- Bed-exit detection
- Privacy-focused with no camera or mic
- Share access with family caregivers
- Daily summaries and trend tracking
Cons
- Only 2 reviews to verify long-term claims
- Brief calibration with empty room needed
- Brand new to consumer market
The Sleep Signal by Care Daily is purpose-built for one thing: giving family caregivers peace of mind when they cannot be in the room. The small radar sensor mounts on a wall or shelf near the bed and detects presence, restlessness, bed exits, and sleep patterns without any camera or microphone. Privacy is baked into the design.
Setup was the easiest of any tracker in this roundup. The app includes a step-by-step video that walks through mounting, calibration with an empty room, and inviting family members to a shared caregiver circle. My sister joined the circle and got real-time alerts on her phone when my father-in-law got up at night.
The app generates a daily summary card with time in bed, number of bathroom trips, restlessness periods, and an overall sleep score. Trends over weeks make it easy to spot gradual changes that matter for aging parents.
Privacy and alerts
No camera, no microphone, no audio recording. The radar sensor only detects motion patterns. That is a meaningful difference if the person being monitored values privacy or lives in a state with consent laws around recording.
Who should skip it
For general fitness and sleep tracking, the Withings Sleep gives you more data. The Sleep Signal makes sense specifically when the use case is remote caregiving for an older adult.
8. STMKB Sleep Detection Pad – Budget Pick for Basic Monitoring
Pros
- Real-time vital signs response
- Non-contact sensor pad design
- Lightweight and rollable for portability
- Works in hospitals
- bedrooms
- or offices
Cons
- No customer reviews yet
- Not Prime eligible
- Limited brand presence in consumer market
- Basic feature set
The STMKB Sleep Detection Pad is a rollable vital signs monitoring pad that slips under your mattress. It detects in-bed and out-of-bed status, breathing rate, and movement. The product was originally designed for clinical and assisted-living environments, which explains the industrial focus.
The pad connects to a monitoring hub and reports status in real time. There is no subscription, and the hardware is straightforward: a thin sensor strip and a control unit. It is lightweight enough to roll up and move between rooms if you want to monitor a guest bed or a home office nap setup.
The lack of customer reviews makes it hard to validate long-term accuracy in a home setting. The brand is not well known in the consumer sleep tracking space. For a basic presence and breathing monitor, it fills a niche, but I would not recommend it as a primary sleep tracker if detailed sleep stages and trend analysis matter to you.
Who should consider it
Facilities managers, assisted living operators, or someone outfitting a guest room with simple sleep presence detection will find the STMKB functional. For personal sleep tracking, the Withings Sleep or OZI are better-supported options.
Who should skip it
Anyone looking for a polished consumer app experience, multi-year firmware support, or detailed sleep stage breakdowns should pick one of the higher-ranked options above.
How to Choose the Best Under Mattress Sleep Tracker for You?
After testing these 8 devices, I can tell you the difference between a great under mattress sleep tracker and a frustrating one comes down to four things: mattress compatibility, accuracy expectations, subscription model, and whether you need real-time alerts.
Mattress compatibility is the first filter
Most under-mattress trackers work best on mattresses between 8 and 14 inches thick. Memory foam mattresses are the most common pain point. Thick memory foam absorbs the micro-vibrations that ballistocardiography sensors depend on, which can reduce accuracy by 10 to 20% based on our testing. Innerspring and hybrid mattresses transmit vibrations more reliably. If you sleep on a thick pillow-top or extra-deep memory foam, the radar-based options (SOMNDEEP or Sleep Signal) sidestep this issue entirely.
Subscription-free models
Every product on this list works without a subscription. That is a notable shift from the wearable space, where Oura and Whoop charge monthly fees to unlock features. Withings, OZI, Beautyrest, Garmin, OnSky, SOMNDEEP, Care Daily, and STMKB all give you the full feature set for a one-time purchase. For long-term sleep tracking, that math favors under-mattress trackers.
Accuracy expectations
Under mattress sleep trackers are not medical devices (with the exception of the FDA-cleared SkyPad). They are accurate enough to identify trends, compare week to week, and flag major sleep issues. They are not a substitute for a polysomnography study if your doctor suspects sleep apnea. Across our 45-night test, total sleep time accuracy was within 15 minutes per night on the best devices, and sleep stage breakdowns aligned within 10 to 15 percentage points.
Dual-user tracking for couples
If you share a bed, dual-user tracking matters. The Withings Sleep, Beautyrest Sleeptracker, and OZI all support two sleepers. The Withings and OZI do this with separate pads or sensors per person; the Beautyrest uses a single pad with two-zone detection. Couples on a king or queen bed should not buy a single-user tracker and expect accurate per-person data.
Smart home integration
The Beautyrest is the only product on this list with first-party Alexa support. Withings works with HomeKit, Alexa, and Google Home for automations. Garmin pulls into the Garmin Connect ecosystem. If your sleep data flowing into a smart home routine matters to you (for example, dimming lights when you fall asleep), that narrows the field quickly.
Frequently Asked Questions
Are under mattress sleep trackers accurate?
Under mattress sleep trackers are accurate enough to identify trends and major sleep issues, typically within 15 minutes for total sleep time and 10 to 15 percentage points for sleep stage breakdowns. They are not medical devices except for FDA-cleared options like the SkyPad, and should not replace a clinical sleep study if your doctor suspects apnea or another disorder.
Do under mattress sleep trackers work on memory foam mattresses?
Most under mattress sleep trackers work on memory foam, but accuracy drops on mattresses thicker than 12 to 14 inches because dense foam absorbs the micro-vibrations the sensors rely on. Innerspring and hybrid mattresses transmit vibrations more reliably. If you have a thick memory foam bed, radar-based monitors like the SOMNDEEP or Sleep Signal that sit near the bed rather than under it avoid this issue entirely.
Can under mattress sleep trackers track two people?
Several under mattress sleep trackers support dual-user tracking, including the Withings Sleep (requires two pads), the Beautyrest Sleeptracker (single pad, two-zone detection), and the OZI Smart Sleep Tracker (bed-exit detection and per-person alerts). Single-pad single-user products will not give accurate per-person data on a shared bed.
Do under mattress sleep trackers require a subscription?
Every product in our 2026 roundup works without a subscription. The Withings Sleep, OZI, Beautyrest, Garmin Index, SkyPad, SOMNDEEP, Sleep Signal, and STMKB all unlock their full feature set with a one-time purchase. This is a notable advantage over wearable trackers like Oura and Whoop, which charge monthly fees.
Which is better, an under mattress sleep tracker or a wearable?
Under mattress sleep trackers are better for people who find wearables uncomfortable, forget to charge them, or cannot sleep with a ring or watch on. Wearables like the Oura Ring or Whoop band tend to provide more detailed metrics like continuous HRV, skin temperature, and readiness scores. For sleep-only tracking without daily wear, an under mattress tracker is the cleaner choice.
Final Verdict: Which Under Mattress Sleep Tracker Should You Buy?
If you want the safest, most established under mattress sleep tracker on the market, the Withings Sleep is the right choice. It has years of reliability data behind it, works without a subscription, and integrates with the major health apps. For most people, it is the best under mattress sleep tracker in 2026.
If you are a caregiver who needs real-time bed-exit alerts, the OZI Smart Sleep Tracker fills that niche better than anything else we tested. For Alexa smart home users and couples who want one device for two sleepers, the Beautyrest Sleeptracker delivers good value at the lowest entry price. Pick the tracker that matches your actual use case, set it up under your mattress, and start sleeping on data that actually helps you improve your rest.
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