| Manufacturer | Garmin |
|---|---|
| Type | Screenless sleep tracking band, worn on the upper arm |
| Series | Index |
| Released | 18 June 2025 (announced 18 June 2025) |
| Price at launch | £149.99 / $169.99 / €169.99 |
| Predecessor | None; the first Garmin sleep band |
| Successor | None directly. The Garmin CIRQA Smart Band can also be worn on the upper arm and tracks sleep, activity and training; see Release Radar for what comes next |
| Sizes | S/M fits an upper arm of 20 to 29cm. L/XL fits 26 to 42cm. |
| Part number | 010-03024-00 (L/XL) |
Specifications as at launch. Features reflect the latest Garmin software.
Expert opinion | What it does not have | Specifications | Battery life | Features | Quick answers | Further reading
Expert opinion
Who it suits: Garmin owners who want full overnight health and recovery data without wearing a watch to bed.
Worn on the upper arm, the band records sleep score and stages, overnight heart rate, HRV, breathing variations, Pulse Ox and skin temperature, and syncs it all to Garmin Connect. That data feeds Training Readiness, recovery time and Body Battery, and a compatible Garmin watch worn by day completes the picture. Battery lasts up to seven nights, and the band goes in the washing machine.
It is not a fitness tracker or a medical device. Its value is filling the overnight gap for anyone who finds a watch uncomfortable in bed.
Garmin Index Sleep Monitor
Advanced optical sleep monitor
What the Index Sleep Monitor does not have
The Index Sleep Monitor is built for one job, tracking sleep, and Garmin’s specification sheet leaves out everything else.
- No screen and no buttons for activities. Data is read in the Garmin Connect app.
- No daytime activity tracking or workout recording. It is meant to be worn in bed, with a Garmin watch or heart rate strap covering the day.
- No GPS, altimeter, compass or gyroscope.
- No ANT+, Wi-Fi or NFC. It connects over Bluetooth Low Energy only.
- No ECG.
Specifications
| Physical | |
|---|---|
| Display | None |
| Module size | 41.7 x 37.6 x 7.8mm |
| Band size | S/M: 326 x 63.5 x 0.55mm. L/XL: 452 x 63.5 x 0.55mm. |
| Weight | Module 14.5g. S/M band 15.8g. L/XL band 20g. |
| Case material | Plastic |
| Band material | Soft, stretchy and breathable: 70% nylon, 30% spandex. Machine washable with the module removed. |
| Wear position | Upper arm |
| Water rating | 5 ATM |
| © the5krunner. Link required. | |
| Sensors | |
| Optical heart rate | Garmin Elevate Gen 5, sampling every second |
| Pulse Ox | Yes, during sleep |
| Skin temperature | Yes |
| Accelerometer | Yes, for sleep |
| Connectivity | |
| Connectivity | Bluetooth Low Energy 5.0 |
| Phone compatibility | iPhone, Android, through the Garmin Connect app |
| Wi-Fi, NFC, ANT+ | None |
| Security updates | Guaranteed until at least 18 June 2027 |
| © the5krunner. Link required. | |
Battery life
| Battery life | Up to 7 nights with Pulse Ox on, based on 8 hours of sleep a night |
|---|---|
| Battery type | Lithium ion |
| Charging | Garmin proprietary plug charger |
Features
The metrics are explained at Garmin features.
Sleep
- Sleep score, sleep stages and sleep insights
- HRV status, measured overnight
- Breathing variations during sleep, using Pulse Ox
- Respiration rate through the night
- Sleep stress, showing calm, balanced or stressful sleep
- Smart wake alarm, which vibrates to wake you at a good point in your sleep before the set time
Health
- Heart rate sampled every second, giving resting heart rate
- Body Battery energy monitoring
- Skin temperature trends
- Pulse Ox blood oxygen saturation during sleep
- Health status, which flags when your overnight data moves away from your usual range (beta)
- Women’s health tracking, with period predictions and past ovulation estimates from skin temperature
Works with a Garmin watch
- TrueUp merges its sleep data with a Garmin watch or heart rate strap worn during the day
- Sleep data feeds Training Readiness, Recovery Time and Body Battery on a compatible watch, so you no longer need to wear the watch in bed
Garmin Index Sleep Monitor
Advanced optical sleep monitor
Quick answers
When was the Garmin Index Sleep Monitor released?
Garmin announced and released the Index Sleep Monitor on 18 June 2025, at £149.99 or $169.99.
Where do you wear the Index Sleep Monitor?
On the upper arm. It comes in two sizes: S/M fits an arm of 20 to 29cm and L/XL fits 26 to 42cm.
How long does the Index Sleep Monitor battery last?
Garmin rates it for up to 7 nights with Pulse Ox on, based on 8 hours of sleep a night. It charges on Garmin’s proprietary plug charger.
Does the Index Sleep Monitor track workouts?
No. It tracks sleep only. Daytime activity and workouts come from a Garmin watch or heart rate strap, and its sleep data feeds Training Readiness on a compatible watch.
What is the difference between the Index Sleep Monitor and the Garmin CIRQA?
The CIRQA tracks activity and training all day, on the wrist or upper arm, and lasts up to 10 days. The Index Sleep Monitor tracks sleep only, from the upper arm, but uses the newer Elevate Gen 5 sensor.
Further reading
- Garmin Index Sleep Monitor: all you need to know
- Why the CIRQA uses an older sensor than the Index Sleep Monitor
- Recovery trackers
- Garmin watch and band specifications
- Release Radar
Related bands
Also consider: the Garmin CIRQA Smart Band, which can be worn on the upper arm at night and adds all-day activity and training tracking.
Garmin CIRQA Smart Band
Screenless health and fitness band (no subscription required)
RRP £179.99
$199.99/€199.99
- use code:
Get it nowOrder now – Garmin CIRQA Smart Band Also sold direct bySmall things I always use
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