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Sleep Tracker Sleep Analyzer (Withings)

Sleep Tracker

Sleep Analyzer (Withings)

£375.00

The Withings Sleep Analyzer is an under-mattress sleep tracking device that monitors your sleep without requiring anything on your wrist.

  • Tracks sleep cycles: light, deep, and REM without a wearable
  • Detects breathing disturbances that may indicate sleep disorders
  • Continuous heart rate monitoring throughout the night
  • Passive tracking improves long-term compliance and data consistency
  • Morning sleep score with granular cycle-by-cycle timeline
4.8(35 reflections)
1

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Sleep TrackerSleep Analyzer (Withings)
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About This Product.

The Withings Sleep Analyzer is an under-mattress sleep tracking device that monitors your sleep without requiring anything on your wrist. You place the thin sensor pad beneath your mattress, and it passively records throughout the night. It tracks sleep cycles — light, deep, and REM — alongside heart rate, breathing disturbances, and movement. The breathing disturbance detection is a clinically relevant feature: it flags irregular patterns that may warrant a conversation with a doctor, making this more than a simple sleep scorer.

The data feeds into a sleep score and a detailed timeline each morning, giving you specific information rather than a vague summary. You can see exactly where a disrupted night went wrong — a long REM deficit, fragmented light sleep, or elevated heart rate in the early hours. That specificity is what lets you act on the data, whether that means adjusting sleep timing, temperature, alcohol intake, or stress load.

This suits anyone who finds wearables uncomfortable at night, or who wants to track a partner's sleep without separate devices. It is equally useful for the serious athlete monitoring recovery and the professional trying to understand why their energy is inconsistent. Because it requires no nightly charging or wearing, compliance tends to be high — the data builds into a meaningful longitudinal record over weeks and months, which is where sleep tracking earns its value.

Under-mattress sleep tracking

Sleep Analyzer (Withings)

How to Take It

i.

Place the sensor pad under your mattress in line with your chest before going to bed. No manual activation is needed — the device starts and stops recording automatically. Sync the companion app in the morning to review your overnight data.

Frequently Asked.

Do I need to wear anything for this to work?

No. The sensor pad sits under your mattress and requires nothing on your body. This makes it well suited to people who find wristbands or rings uncomfortable during sleep.

What does the breathing disturbance detection actually measure?

The device monitors chest movement and sound to identify irregular breathing patterns during the night. It does not diagnose sleep apnoea, but it can flag disturbances worth discussing with a GP or sleep specialist.

Will it work on any mattress type?

The device is designed to work under most standard mattresses. Very thick or heavily layered mattresses may affect sensor sensitivity — check the Withings compatibility guidance before purchasing.

How is this different from a smartwatch that tracks sleep?

An under-mattress device removes the compliance problem: there is nothing to charge, put on, or forget. It also tends to be less affected by wrist movement artefacts, which can skew cycle-stage data on wrist-based trackers.

How long before the data becomes useful?

A single night gives you a baseline, but sleep tracking earns its value over weeks. Patterns in your REM consistency, breathing scores, and heart rate trends become meaningful once you have a longitudinal record to compare against.

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Customer Reflections

Overall Sentiment

4.835 reflections
1 – 6 of 35 reflections
JW

Finally a sleep tracker I actually use every night

4 months ago

Had a Fitbit for two years and kept taking it off halfway through the night because it annoyed me. This sits under the mattress and I genuinely forget it's there. The morning breakdown is surprisingly detailed — I can actually see where I lost REM on nights I had a glass of wine. That kind of specificity is what makes it useful rather than just interesting.

ST

Better data than my Apple Watch

4 months ago

Wore an Apple Watch to bed for a year. This gives more granular sleep stage info and I don't wake up with a sweaty wrist. The breathing disturbance feature is worth the price alone — flagged something I hadn't noticed and I brought it up with my GP. Worth every penny.

MB

Great device, app could do with some work

5 months ago

The sensor itself is excellent. Really thin under the mattress, I can't feel it at all. My gripe is with the Health Mate app — navigating back to older sleep data is clunky, you have to scroll through a timeline rather than just picking a date. The sleep data itself is detailed and genuinely useful, but a better calendar view in the app would make it so much easier to spot patterns over time.

NO

Ideal if you hate wearing things at night

5 months ago

I'm a really light sleeper and any wristband woke me up. This is completely passive — set it up once and it just works. Three months in and the longitudinal data is genuinely interesting. I've correlated poor sleep scores with stress at work without even trying.

PM

5 months ago

Setup was straightforward and the first morning report gave me more useful information than six months of tracking with a ring. Highly detailed breakdown each morning. My partner doesn't even know it's there.

T

Solid piece of kit

5 months ago

Running coach recommended this as part of recovery monitoring during marathon block. The consistency of data over 12 weeks has been really valuable — you can see how hard training weeks affect deep sleep. No charging, no fuss.

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