sleep science + tools
the sleep tracker
$99.99
free shipping · 30-night trial
Your sleep, quantified.
Most sleep tracking lives on your wrist — competing with movement data, heart rate variability noise, and the bulk of a watch. The Somnos Sleep Ring sits where sleep science belongs: on your finger, where blood flow is stable, skin contact is consistent, and photoplethysmography signals are cleanest.
Worn through the night, it tracks every stage of your sleep architecture — light, deep, and REM — alongside blood oxygen saturation, resting heart rate, HRV, skin temperature deviation, and respiratory rate. In the morning, your data is waiting: a complete overnight report broken into the metrics that actually matter for recovery and cognitive performance.
Thin enough to forget you're wearing it. Precise enough to act on.
The Science
Sleep quality cannot be assessed by duration alone. The ratio of slow-wave sleep to REM, night-to-night HRV trends, and oxygen desaturation events are the markers that predict next-day performance, hormonal recovery, and long-term health outcomes. The finger is the optimal peripheral site for optical sensing — the digital arteries run close to the surface, motion artefact is low compared to the wrist, and skin temperature here reflects core thermoregulatory shifts with high fidelity. The Somnos Sleep Ring captures all of this passively, requiring no input and no disruption to your sleep environment.
What It Does For You
- Tracks sleep stages: light, deep (slow-wave), and REM with stage-by-stage breakdown
- Monitors blood oxygen saturation (SpO₂) throughout the night
- Records resting heart rate and heart rate variability (HRV)
- Detects skin temperature deviation from your personal baseline
- Estimates respiratory rate and flags irregularities
- Generates a morning Sleep Score with actionable recovery insights
- Syncs to the Somnos app via Bluetooth — no manual logging required
- Pairs with your full Somnos protocol stack for a complete sleep optimisation picture
Specifications
- Material: Aerospace-grade titanium outer shell, medical-grade PPG and NTC sensors
- Battery life: Up to 7 days per charge — USB-C magnetic charging cradle included
- Water resistance: IPX8 — safe for showering and handwashing
- Connectivity: Bluetooth 5.3
- Charging time: Approximately 60–80 minutes from flat
- Compatibility: iOS 15+ and Android 10+
- Colors: Gold, Silver, Black, New Black
- Sizes: 8, 9, 10, 11
Size Guide
| Size | Inner Diameter | Fits Finger Circumference |
|---|---|---|
| 8 | 18.2 mm | 57.2 mm |
| 9 | 19.1 mm | 59.9 mm |
| 10 | 19.8 mm | 62.1 mm |
| 11 | 20.6 mm | 64.7 mm |
built for deeper sleep
Every Somnos tool starts with the science of sleep — light, breath, temperature, and the nervous system — and ends as something you'll actually use every night.
designed to disappear
No screens, no noise, no friction. Just quiet hardware that fades into your evening routine and stays out of the way of your sleep.
$99.99