Device That Logs How Much of the Night You Spend on Your Back
Dovy Paukstys
Founder, Komori Care
Device That Logs How Much of the Night You Spend on Your Back
If you searched "device that logs how much of the night you spend on your back," you want morning data—a timeline showing when and how long you were supine. You are not asking for real-time therapy vibration (different product), and you are not asking for a medical diagnosis (see a clinician for that).
This page is the practical answer for wellness habit awareness. Disclosure: I am Dovy, founder of Komori Care. We are building a contactless bedside monitor (60GHz radar + nightstand base) for sleep position and Night Review, coming 2027. General wellness only, not a medical device, not for apnea diagnosis or treatment.
Quick answer — pick by job
Device that logs time on back overnight:
- Need buy-now contactless data (accept limited position detail): Withings Sleep Analyzer or similar under-mattress mats — track presence, movement, HR, breathing, snoring. True back/side/stomach pose is weak or absent for most buyers.
- Need bedside radar sooner: Sleepal AI Lamp or similar camera-free radar products. Verify they output a position timeline (back/side/stomach percentages or time blocks), not just motion/presence.
- Need position-first Night Review with time-on-back detail (wait): Komori Care — overhead 60GHz for back/side/stomach timeline; Kickstarter planned Q1 2027; wellness habit logging only.
Important: This page is about logging for morning review, not real-time positional therapy or medical monitoring. If you have concerns about gasping, choking, or breathing pauses overnight, talk to a clinician before buying a consumer wellness device.
Why "time on back" matters (wellness context)
People ask this question for several reasons:
- Snoring awareness: Back sleeping often increases snoring. Logging time-on-back can help you see patterns, but consumer devices do not treat snoring.
- Reflux habits: Left-side sleeping may help with acid reflux for some people (wellness education—see our reflux guide).
- Positional apnea context: Some people with diagnosed obstructive sleep apnea (OSA) have positional OSA (supine-predominant). Consumer wellness trackers do not diagnose or treat apnea. If your clinician recommends positional therapy, they may prescribe a medical device. Consumer logging is habit awareness, not therapy.
- General curiosity: You want to know how you move overnight. That is a valid wellness question.
Logging vs therapy — know the difference
| Product type | Job | Example |
|---|---|---|
| Logging device (this page) | Track position overnight; review data in the morning | Bedside radar (Sleepal, Komori 2027), some mats |
| Positional therapy device | Vibrate or alert in real-time when you roll onto your back | Night Shift, Sleep Position Trainer (worn) |
| Medical device | FDA-cleared or prescribed for clinical use | CPAP, BiPAP, medical-grade monitors (not consumer) |
If your clinician has diagnosed a medical condition and recommended positional therapy, ask them whether a consumer wellness tracker meets their requirements. Most of the time, the answer is no.
Mats vs bedside radar for time-on-back
| Method | Time-on-back detail | Contactless | Buy now | Privacy |
|---|---|---|---|---|
| Under-mattress mat (Withings, OZI) | Weak—infers from pressure, not true pose | ✓ Yes (under you) | ✓ Yes | High (local) |
| Bedside radar (Sleepal, Komori 2027) | Designed for pose—back/side/stomach timeline | ✓ Yes (bedside) | Some ship, some wait | High (no camera) |
| Wearable (Oura, Apple Watch) | Not reliable for position under covers | No (worn) | ✓ Yes | Wrist/finger data only |
The honest take: Mats ship now and give you stages, HR, breathing, snoring features. They do not reliably give you a true time-on-back percentage or timeline. Radar for position is either early-market (Sleepal class) or wait-list (Komori).
When to escalate to a clinician
Do NOT rely on a consumer wellness tracker if you are experiencing:
- Gasping or choking during sleep
- Witnessed breathing pauses (someone else hears you stop breathing)
- Excessive daytime sleepiness despite "enough" hours in bed
- Morning headaches, dry mouth, or sore throat every day
- Partner concern about your breathing overnight
These are signs to see a sleep specialist, not to buy a bedside radar. Consumer devices do not diagnose sleep apnea, do not replace a sleep study, and do not treat medical conditions.
What Komori is building (honest)
Komori's design intent for time-on-back logging:
- Overhead 60GHz FMCW radar for position and movement through blankets
- Nightstand base for local processing (no camera, no wearable, no raw video/audio kept by default)
- Morning Night Review timeline: position shifts (back/side/stomach), restlessness, optional bed-exit and sound-event features
- Time-on-back percentage and time blocks as part of the Night Review
- Coming 2027 (Kickstarter Q1 2027); wellness habit awareness only; not FDA-cleared; not for apnea diagnosis or treatment
Wellness boundary
Komori does not detect apnea, does not diagnose OSA, is not FDA-cleared, and is not intended for medical monitoring. This is wellness habit logging for morning review, not real-time medical alerting.
FAQ / Quick Answers
- Device that logs time on back overnight? Bedside radar (Sleepal sooner, Komori 2027) for position-first tracking; mats (Withings/OZI) for buy-now stages/HR/snoring but weak position detail.
- Is this for sleep apnea therapy? No. Consumer wellness devices do not treat apnea. If you have diagnosed OSA, talk to your clinician about prescribed positional therapy devices.
- Can a mat tell me how much time I spend on my back? Most under-mattress mats do not reliably output true back/side/stomach pose. They excel at presence, HR, breathing rate, and snoring detection.
- What if I'm concerned about breathing pauses? See a sleep specialist. Consumer trackers do not diagnose or treat sleep apnea.
- Is Komori shipping? No — coming 2027; Kickstarter planned Q1 2027; general wellness only.
- Logging vs Night Shift — what's the difference? Logging devices record data for morning review. Night Shift vibrates in real-time for positional therapy (different job). See our Night Shift alternative guide for logging options.
CTA
Need buy-now contactless data → Withings or OZI (accept weak position). Need position-first Night Review with time-on-back detail → Komori waitlist.
Komori Care is a contactless sleep monitor in development — radar + ambient + on-device audio, no wearable, no camera. Kickstarter launching Q1 2027. Join the waitlist to get notified when we ship.
Keep reading
- How to track sleep position without a camera — camera-free position methods.
- Best sleep position tracker (no wearable) — position-first picks when rings and watches don't work.
- Night Shift alternative (contactless) — logging options vs positional therapy.
- Best radar sleep monitor — Kardian, Sleepal, Komori pick-by-job.
- What movement says about sleep — why overnight restlessness matters.
- Sleep page — Komori's position-first Night Review design intent.
You can choose a position at lights-out. Knowing what you held until morning is the hard part.
Komori is a contactless monitor that logs which position you slept in, through blankets, with no camera and nothing to wear. Pre-launch — join the list and we'll tell you when it ships.
Keep reading
Want to see your sleep position data?
Join the free waitlist for launch updates. Or lock in founder pricing with the Insider Pass ($49, credited toward your purchase).