Garmin Index Sleep Monitor
Fitness band · iPhone and Android
- Cheapest price
- £119
- Subscription
- Optional
- Over 3 years
- £119
Prices
- Sigma Sports£119View at Sigma Sports (opens in a new tab)
- Blacks£129View at Blacks (opens in a new tab)
- John Lewis£135.83View at John Lewis (opens in a new tab)
- Garmin£149.99View at Garmin (opens in a new tab)
- AmazonAmazonFind it on Amazon (opens in a new tab)
We earn commission on some of these links. It never changes the order. Disclosure
What it measures
- Heart rate
- Resting heart rate
- HRV
- Sleep stages
- Deep sleep
- Blood oxygen
- VO2 max (no)
- Breathing rate
- Skin temperature
- Readiness score
- Steps (no)
- ECG (no)
- GPS (no)
- Blood pressure (no)
- Cycle tracking
As garmin.com states it.
What it does
A screenless sensor module in a soft fabric band worn on the upper arm only at night. It records heart rate, HRV, blood oxygen, breathing, skin temperature and sleep stages for the Garmin Connect app, and has an alarm.
From the description on garmin.com.
Garmin Index Sleep Monitor specs
- Type
- Fitness band
- Works with
- iPhone and Android
- Battery
- 7 nights with SpO2, typical use of 8 hours' sleep (maker's claim)
- Water resistance
- 5 ATM
- Module size
- 41.7 x 37.6 x 7.8 mm
- Weight
- Module 14.5 g; sleep band S-M 15.8 g, L-XL 20 g
- Band
- 70% nylon, 30% spandex; S-M 326 mm long, L-XL 452 mm long
- Case
- Plastic
- Connectivity
- Bluetooth Low Energy 5.0
- Charging
- Garmin proprietary plug charger
- Security updates
- Until at least 2027-06-18
Further specs from garmin.com.
How it compares
- To buy, it is the 5th cheapest of 14 fitness bands we compare (the middle one costs £144.75).
- Over three years, subscription included, it is the 5th cheapest of 14 fitness bands.
- It measures 5 of the 8 features we compare; the middle fitness band measures 5.
- It needs no subscription; 3 of the 14 do.
Garmin Index Sleep Monitor reviews and discussions
Reviews
- Tom's Guide review of the Garmin Index Sleep Monitor
- DC Rainmaker review of the Garmin Index Sleep Monitor 2025-06
Which?
- Which? tests of this kind of product members' content
Owners talking about it
- First Impressions - two nights Garmin forums
- Deeply disappointing experience with the Index Sleep Monitor Garmin forums
- Evidence that the Index Sleep Monitor produces bad heart rate data Garmin forums
Links to other sites' reviews and discussions; we do not run them and they are not ours.
Subscription
- Garmin Connect+ optional: £69.99 a year (£6.99 a month).
- Adds: Optional Garmin Connect app extras; the band's sleep data stays free
- Source: garmin.com
Questions
- Where is the Garmin Index Sleep Monitor cheapest?
- Sigma Sports, at £119 when checked on 2026-10-29.
- Does the Garmin Index Sleep Monitor need a subscription?
- Garmin Connect+ optional: £69.99 a year. It adds: Optional Garmin Connect app extras; the band's sleep data stays free
- What does the Garmin Index Sleep Monitor cost over three years?
- £119, the price plus any required subscription.
- How does the Garmin Index Sleep Monitor compare with other fitness bands?
- To buy, it is the 5th cheapest of 14 fitness bands we compare (the middle one costs £144.75). Over three years, subscription included, it is the 5th cheapest of 14 fitness bands. It measures 5 of the 8 features we compare; the middle fitness band measures 5.
Compare with
- 1
- 3 years
- £129.99
- Price
- £129.99
- Subscription
- Optional
- 2
- 3 years
- £139.99
- Price
- £139.99
- Subscription
- Optional
- 3
- 3 years
- £149.50
- Price
- £149.50
- Subscription
- None
Readings are not a diagnosis. If you are worried about your health, speak to your GP, pharmacist or NHS 111. How we earn.