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
1
Poor sleep tracker.
on June 25, 2026
Posted by: Salas720
I bought this but unfortunately returned it already. It repeatedly lost connection and would not track sleep or was very inconsistent.
Written by a customer while visiting Garmin
Customer Rating
1
Great idea -- really poor execution
on June 25, 2026
Posted by: WantToLikeItButHateIt
Software (and hardware?) really not reliable. Seems like I am having to troubleshoot it weekly if not every other day. Wish I never bought it.
Written by a customer while visiting Garmin
Customer Rating
5
Great sleep tracking tool
on June 24, 2026
Posted by: Pcg2k
I bought this to stop wearing my watch at night and get a bit of a break. It a very comfortable band that is well priced and gets you good sleep stats through the night. Love the continuity of having both options and it works great together.
Written by a customer while visiting Garmin
Customer Rating
3
Skin Irritation
on June 19, 2026
Posted by: SLML
I would love this product if it did not irritate my skin to cause itching and discoloration. I don't understand how I can wear watches, chest straps, and other arm monitors, but this one irritates my skin. Is there anything that I can put around it and still give accurate readings?
Written by a customer while visiting Garmin
Customer Rating
2
Lost Sleep Data Again
on June 19, 2026
Posted by: nggry
Good concept, but reliability is a major issue. In less than a year of use, I have already had to re-pair the device 3–4 times because it suddenly stopped syncing and could no longer be detected by Garmin Connect. The latest failure caused the loss of a full night’s sleep data. For a device designed to track sleep automatically, this level of instability is frustrating.
Written by a customer while visiting Garmin
Customer Rating
5
Excellent sleep tracker
on June 14, 2026
Posted by: SNelson401
I bought the strap to relieve my wrist from the watch at night. I love it. It fits perfectly, tracks the sleep data and syncs to my garmin connect in the morning.
Written by a customer while visiting Garmin
Customer Rating
1
A let down
on June 11, 2026
Posted by: Don’t bother
Completely unreliable as to whether it’s going to record sleep, connect to my app to transfer information, or if an alarm is going to function, if the alarm is goi g to function the vibration even set on high is so slight I can’t depend on it to wake me up. I’ve honestly been putting my old Fitbit on as an alarm instead.
Written by a customer while visiting Garmin
Customer Rating
3
Provides Useful Data but Has Many Shortcomings
on June 5, 2026
Posted by: robertus
The first thing I encountered was a big negative: I have an older model iPhone, and the Garmin Connect software will not run on it. I think it is lousy that Garmin doesn't support older versions of iOS. I had to borrow someone else's phone to do the initial set-up. Fortunately, after having done that, I can operate and manage the device without using a phone via Garmin Express on my computer and the web version of Garmin Connect. (Why couldn't Garmin allow initial set-up using the web interface of Garmin Connect?) The web version of Garmin Connect does not allow me to change settings or set alarms, but that is not a big deal for me. I'm a bit disappointed that the data that can be downloaded to a computer appears to be limited. Some data can be exported to .csv files, but not all. The raw data apparently cannot. This is a big negative for me. I would have preferred to be able to put the data into a spreadsheet rather than only being allowed to look at Garmin's plots in Garmin Connect. One big positive is that it is very comfortable and convenient to wear at night—much more so than any other type of overnight monitor I've tried. It does provide the data that I was most interested in: sleep quality. However, I have observed some inconsistent behavior: it started recording skin temperature change and HRV status after a few days of recording, but then abruptly stopped for some unknown reason. I have not been able to re-start collection of these data. Coincident with this stoppage was some clock error where the recorded sleep times were way off. Reconnecting with Garmin Connect on the phone seemed to fix the clock, but I still haven't got skin temperature or HRV data back yet.
Written by a customer while visiting Garmin