Customer reviews from Garmin
Garmin - Index Sleep Monitor Size: L/XL - Black - (2025)
Average customer rating
3.3
(223 Reviews)
Rating breakdown 223 reviews
5 Stars
66
4 Stars
48
3 Stars
38
2 Stars
29
1 Star
42
Customer Reviews for Garmin - Index Sleep Monitor Size: L/XL - Black - (2025)
Customer Rating
2
Not a Good Product!
on August 13, 2026
Posted by: Doug77777777777
I bought this device to take the place of my Instinct2 watch. I don't like wearing my watch when I sleep so was hoping this would be better. These are the issues that I really don't like - Only 7 days of charge, unique and proprietary charging cable. Battery died and reconnecting took a very long time.
Written by a customer while visiting Garmin
Customer Rating
5
Comfortable and valuable information.
on August 12, 2026
Posted by: RaceJunkie
Comfortable!! You can't even tell it is there. So far, I have had it for over 2 weeks and it has already helped me understand my 24-hour information better. I am a triathlete who trains non-stop, and this has made my routine and scheduling make more sense, to make the best of my rest and my training.
Written by a customer while visiting Garmin
Customer Rating
5
Sleep Cuff for the win
on August 9, 2026
Posted by: Shnobe
It’s been six months or so, and at night I forget that it is on. The battery life is good, and as long as you throw it on the charger, it will quietly and comfortably collect your sleep data without a clunky watch
Written by a customer while visiting Garmin
Customer Rating
3
Does Garmin not even want this to be good?
on August 9, 2026
Posted by: JC Twin Cities
I purchased this sleep monitor because I have a Garmin watch and one for my girlfriend. We generality like the concept of having the ability to gage the quality of our sleep and track duration, but we've had considerable frustration with the accuracy and consistency of these devices. We've found the tracking of sleep occurring when we're obviously awake as well as having the time be off by multiple hours to when we put the device on and when it said we fell asleep. We've had to reset these devices many times to try and get them to record accurately. Even when it does, we often don't get the data due to problems with the upload where we get no sleep data, dispite our stress and heart rate days showing up in our daily feed. It feels like Garmin rushed this out and didn't even want to support/ improve on the software after release. It's not worthless by any means, but as someone who owns multiple watches, bike computer, bike radar, heart straps, etc. this is by far the poorest execution of Garmin tech I own. Especially for the price. My girlfriend has recently decided she's going to buy an apple watch instead to track her sleep.
Written by a customer while visiting Garmin
Customer Rating
5
Sleeping better!
on August 2, 2026
Posted by: DWill
I've been using this for a couple of weeks. My sleep is improving, not because the band makes me sleep better, but because it makes me more aware of my sleep habits. I have been able to make adjustments. I enjoy the expanded data, as well.
Written by a customer while visiting Garmin
Customer Rating
2
Some Issues
on July 31, 2026
Posted by: A.F.B.
I bought the Sleep Monitor a couple months ago, to avoid having to wear the Fenix 8 during the night.
Generally speaking the data measured seems to be accurate.
From a wearable perspective, it is a bit uncomfortable when used during the night. The band should be more flexible and the plastic buckle designed in a way that is is more comfortable.
This night the device stopped working, requiring a disconnect from Garmin Connect App and a re-connection. Of course all sleep dat was lost.
Generally speaking the data measured seems to be accurate.
From a wearable perspective, it is a bit uncomfortable when used during the night. The band should be more flexible and the plastic buckle designed in a way that is is more comfortable.
This night the device stopped working, requiring a disconnect from Garmin Connect App and a re-connection. Of course all sleep dat was lost.
Written by a customer while visiting Garmin
Customer Rating
5
on July 24, 2026
Posted by: Pilch
Easy to use. Comfortable to wear. I don't notice it on my arm. It's nice to see how long you sleep and the different stages of sleep.
Written by a customer while visiting Garmin
Customer Rating
3
Disappointed
on July 23, 2026
Posted by: Sean O’
Only records data about 1/2 the time. Pretty disappointed with this product.
Written by a customer while visiting Garmin