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THE MOST COMFORTABLE SLEEP YOU’VE EVER TRACKED
For a more comprehensive view of your fitness and recovery, the Index Sleep Monitor is the lightweight smart band that tracks your sleep while maximising comfort.
COMFORTABLE, BREATHABLE DESIGN WORN ON THE UPPER ARM
UP TO 7 NIGHTS OF BATTERY LIFE
SLEEP TRACKING AND RECOVERY METRICS
BREATHING VARIATIONS THROUGHOUT THE NIGHT
SKIN TEMPERATURE TRACKING FOR PAST OVULATION ESTIMATES AND MORE
MACHINE-WASHABLE BAND FOR EASY CLEANING
WHAT YOU'LL LOVE
SLEEP TRACKING
How did you sleep? The Index Sleep Monitor gives you insight with sleep score, sleep stages, HRV status and more, so you can better understand how well you recovered.
COMFORTABLE DESIGN
Worn on the upper arm, this lightweight and breathable smart sleep band comes in two sizes, allowing you to get the data you need without compromising comfort.
SEAMLESS DATA SYNCING
The Index Sleep Monitor seamlessly syncs your data with the Garmin Connect™ smartphone app. If you wear a compatible Garmin smartwatch during the day or a heart rate monitor during workouts, your data will seamlessly sync via Garmin Connect for more insight into your health and fitness.
BREATHING VARIATIONS
For a closer glimpse of your health, the breathing variations feature uses Pulse Ox to help you better understand shifts in your breathing patterns as you sleep.
SLEEP DATA INTEGRATION
Don’t wear your compatible smartwatch to bed? The Index Sleep Monitor can help fill in the gaps. It provides the sleep data needed for a more complete picture of your training metrics, including training readiness, recovery time and more.
WOMEN’S HEALTH
Using skin temperature, get more insight into your menstrual cycle, including better period predictions and past ovulation estimates. Track your menstrual cycle or pregnancy plus get exercise and nutrition education in the Garmin Connect app.
BETTER SLEEP, BETTER RECOVERY
HEART RATE
The Index Sleep Monitor continuously samples your heart rate throughout the night to provide your resting heart rate.
HRV STATUS
Gain a deeper understanding of your overall health through heart rate variability while you sleep.
SMART WAKE ALARM
Wake up more refreshed. The smart wake alarm gently vibrates to wake you at the optimal time.
SKIN TEMPERATURE
See how your average skin temperature changes, which can be related to your recent activity, sleep environment, potential illness and more.
PULSE OX SENSOR
Track your blood oxygen saturation while you’re asleep.
BODY BATTERY™ ENERGY MONITORING
See your energy levels so you’ll know when your body is charged or needs more rest. If you wear a compatible smartwatch while awake, get a more complete picture of your energy levels — night and day.
STRESS TRACKING
Find out if you’re having calm, balanced or stressful sleep.
RESPIRATION
See how you’re breathing throughout the night.
MACHINE WASHABLE
Cleaning the monitor is simple. Just remove the module, and toss the band into the washing machine.
| What You'll Love | |
|
Sleep Score and Insights |
Yes |
| General | |
| Strap material |
Soft, stretchy, breathable mix. 70% Nylon, 30% Spandex |
| Case material | Plastic |
| Physical size |
Module: 41.7 x 37.6 x 7.8 mm (1.6″ x1.5″ x 0.3″) |
| Weight |
Module: 14.5 g (0.5 oz) |
| Battery life |
7 nights with SPO2 during typical usage (8 hours of sleep) |
| Health & Wellness Monitoring | |
| Resting heart rate | Yes |
| Heart rate | Yes |
| Respiration Rate | Yes |
|
Body Battery™ Energy Monitor |
Yes |
| Sleep | |
| Women's Health | Yes |
|
Past ovulation estimates |
Yes |
| Skin temperature | Yes |
| Sensors | |
|
Pulse Ox Blood Oxygen Saturation Monitor |
Yes |
| Accelerometer | Yes (for sleep) |
| Daily Smart Features | |
| Connectivity |
BLE (BLUETOOTH Low Energy 5.0) |
In addition to our 30 day returns policy, all items purchased from 1st October 2026 can now be returned until 15th January 2027, terms apply.
We aim for you to be absolutely delighted with your purchase and therefore offer you 30 days to change your mind on your purchase. You may do this by using the form provided with your order or otherwise. We will provide a refund of all payment received (not including delivery upgrades), usually within 2 working days of receiving your return (it may take a little longer during busy periods or for more complex returns). This will be made to the original payment method. For most payment methods it will take 3-5 working days for this to show on your statement.
Please ensure items from your order are suitable before wearing as we are unable to accept items which have been worn under our returns policy.
Returns are free on all UK orders. For orders under £500, you may generate a free tracked and insured returns label on the Royal Mail website (opens in a new window). You can print this label and send it back at any local Post Office at no cost to yourself. It is also possible to have the label printed at Post Office using the QR code from the confirmation email. Please retain the proof of postage receipt. Unfortunately we are unable to refund return postage for orders under £500 sent back by other methods, so we recommend printing the free postage label provided. For orders from £500 to £2,500, the Royal Mail label does not cover the value of the item, so please send it back by Royal Mail Special Delivery, insured for its full value, and we will reimburse the postage separately (please keep your proof of postage — full details are on your receipt), or contact us and we can arrange a collection. For orders over £2,500, please contact us and we will arrange the return for you. For international returns, you will need to bear the cost of returns postage. Please ensure the watch is returned to us in an unworn, new condition with all the original packaging (manufacturer's manual and guarantee if applicable). Please ensure items from your order are suitable before wearing as we are unable to accept items which have been worn under our returns policy. We reserve the right to make deductions for unnecessary damage caused to the product by yourself.
For UK orders we are also able to offer an exchange to a different product if required, please specify this when returning your product. For international orders, please return the item for a refund and place a new order for the product you would like.
If a fault develops with a watch that is outside of the 30 day returns period or is no longer in a new condition the watch can be returned to the manufacturer under the terms of the guarantee (we are an official UK dealer for all brands on our website) so that they can rectify any issues. For more information please see our returns policy page.
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© 2026 First Class Watches
First Class Watches is the trading name of First Class Watches Limited, 9 Warwick Road, Kenilworth, Warwickshire, CV8 1HD. Company Reg. 06197115. UK VAT Reg. GB172671009. First Class Watches Limited acts an authorised credit broker and not a lender who offers credit from different providers, including PayPal Credit and Secure Trust Bank PLC trading as V12 Retail Finance. First Class Watches Limited is authorised and regulated by the Financial Conduct Authority. Our FCA registration number is 688157. ** Credit is provided subject to affordability, age and status. Minimum spend applies. PayPal Credit and PayPal Pay in 3 are trading names of PayPal UK Ltd, 5 Fleet Place, London, United Kingdom, EC4M 7RD. Klarna is a trading name of Klarna Bank AB (publ). Sveavägen 46, 111 34 Stockholm, Sweden. V12 Retail Finance is a trading name of Secure Trust Bank PLC, One Arleston Way, Solihull, B90 4LH. The example below represents the typical costs of using PayPal Credit as a standard funding method. Interest on your instalment offer is fixed for its duration. See terms for more details. Full Representative Example: Representative 23.9% APR (variable), Purchase interest rate 23.9% p.a. (variable), Assumed credit limit £1,200.00.