Free deliveryWhy The Wellness recommends this
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Most sleep trackers tell you how long you slept. The Withings Sleep Analyzer tells you the quality of each stage and flags breathing irregularities that often go unnoticed for years. We recommend it because the data it surfaces is clinically meaningful — specific enough to act on, and detailed enough to share with a doctor or coach. For anyone building a serious picture of their recovery, this is one of the more rigorous tools available without a clinical sleep study.
About this product
Sleep Analyzer (Withings)
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.
What it does
Benefits
- 01
Tracks sleep cycles: light, deep, and REM without a wearable
- 02
Detects breathing disturbances that may indicate sleep disorders
- 03
Continuous heart rate monitoring throughout the night
- 04
Passive tracking improves long-term compliance and data consistency
- 05
Morning sleep score with granular cycle-by-cycle timeline
Get the most from it
How to use
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.
What's inside
Ingredients
View full ingredient list
Under-mattress sleep tracking
Common questions
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.
Doctor-guided care
Performance has a baseline.
Body composition, hormones, VO₂ max — we measure them all. Train against the picture, not against guesswork.
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