Customer reviews from Garmin
Garmin - Index Sleep Monitor Size: S/M - Black - (2025)
Average customer rating
3.3
(226 Reviews)
Rating breakdown 226 reviews
5 Stars
67
4 Stars
48
3 Stars
38
2 Stars
30
1 Star
43
Customer Reviews for Garmin - Index Sleep Monitor Size: S/M - Black - (2025)
Customer Rating
1
Constant syncing issues
on November 13, 2026
Posted by: Jhee
Have this item for some time now. Spent more time to reinstall than using it. Constant syncing issues bundled with poor service to solve matters from Garmin
Written by a customer while visiting Garmin
Customer Rating
2
Meh I wouldn’t buy again
on November 10, 2026
Posted by: JayB17
Junk save your money totally not worth the price and some days it decides not to sync
Written by a customer while visiting Garmin
Customer Rating
5
no more watch to sleep!
on November 5, 2026
Posted by: ramirez42
had this for a whole month and so happy i bought it! i would buy this all over again! males get the large/xl i have the small medium and its snug but extra space wouldn't be bad. over all i love it!
Written by a customer while visiting Garmin
Customer Rating
3
Great 1 point Uh Oh Device
on November 5, 2026
Posted by: Parzival
Ever since I had a Microsoft Band and was introduced to the smart sleep alarm it had where you can set a time you wan to wake up and if you come out of deep sleep within 30 minutes of that, you band would vibrate and easily wake you up. Well, like everything Microsoft, the haters gonna hate and it failed. I have been waiting YEARS for someone to buy or come up with that amazing technology. It seemed that Garmin finally invented their own. I have many Garmin devices and when I saw the Index, I was in.
I would say it is not as smart as the Band as 99.5% of the time it would vibrate right when the alarm was set for. Statistically, that is impossible. Even still, I keep wearing it as I would rather be easily vibrated awake than hear some annoying alarm.
My reason for the 3 stars is because on about 3 occasions, every couple of months or so, I wake up and notice the time is AFTER my alarm. This is not an "I forgot to charge it and it died" issue because the app alerts me when it is low. I have noticed that the connection between the Index and the Garmin app seem to get lost. It still knows I have one, it just is unaware that it is on and has power. This happened again last night and I checked and nope, no connection. I see lights.
What I typically have done to fix it is to tell the app to forget device and then I reconnect/pair it and that seems to work... for a time.
Written by a customer while visiting Garmin
Customer Rating
4
Great for those that want 24/7 metrics like me.
on November 4, 2026
Posted by: CaptainJeff
I use a fenix as my daily wear and had been sleeping with it on, to capture my sleep metrics, which I find very valuable. However, wearing such a big watch to bed was quite uncomfortable at times, and I also ran into the challenge of when to charge it with minimal interruption to my all-day metrics. This product offered an ideal solution; I swap at bedtime and when I wake up, the IDM captures my sleep metrics, my fenix captures my awake metrics, and Connect combines them together seamlessly. My only gripe is that the hard plastic clip that is part of the band can be uncomfortable at times, depending on how I lay, and the band can slide all to one side of the clip as I sleep, loosening up the device. Minor, but still notable. All in all, I love it and am glad to have it in my arsenal of tools.
Written by a customer while visiting Garmin
Customer Rating
1
Didn’t work.
on November 3, 2026
Posted by: Data
It would record sleep that didn’t happen, never capture my overnight HRV, and ultimately did not work at all.
I returned it after a week and went back to wearing my Enduro 3.
Written by a customer while visiting Garmin
Customer Rating
5
Functional and Useful
on November 2, 2026
Posted by: btcrowley
I have been using this a on nightly basis for a few months. It does an exceptional job of providing me with valuable data on my sleep. As a separate unit, specifically made for monitoring sleep, it provides more detailed information than sleeping with a smart watch.
Written by a customer while visiting Garmin
Customer Rating
5
Pretty Awesome!
on October 29, 2026
Posted by: brian0426
Best part of the Sleep Monitor is when you are wearing it you don't even notice it, which is awesome. I also really appreciate all the metrics it produces and that has encouraged me to do a better job when it comes to my sleep which is so important in your overall health.
Written by a customer while visiting Garmin