Customer reviews from Garmin
Garmin - Index Sleep Monitor Size: S/M - Black - (2025)
Average customer rating
3.3
(192 Reviews)
Rating breakdown 192 reviews
5 Stars
55
4 Stars
43
3 Stars
34
2 Stars
22
1 Star
38
Customer Reviews for Garmin - Index Sleep Monitor Size: S/M - Black - (2025)
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
Customer Rating
5
Sleep Easy
on June 5, 2026
Posted by: Mikey on the bikey...
So far I am very happy with the sleep monitor. It is more accurate than the wrist watch and is comfortable to wear. I don't notice it at night. I don't have any real sleep issues but it is great to track my fitness metrics.
Written by a customer while visiting Garmin
Customer Rating
3
?
on May 26, 2026
Posted by: Nonejjjjj
Not as accurate as I would have thought. I know that I was awake the other night, but the monitor indicated I was asleep the whole night.
Written by a customer while visiting Garmin
Customer Rating
1
Failed Product
on May 21, 2026
Posted by: brettrf
I've had the sleep monitor for a week - and it has not once gathered sleep data. 2/7 nights it collected heart rate - which my watch could already do. I have experimented with syncing, turning off my water, etc - nothing has worked. The sleep monitor issues are part of a larger weakness in the Garmin eco system.
I am probably a couple days from sending it back. The device should be pretty simple - gather data from a direct reading and send it to the paired phone. If you are looking for a product that does what it advertises with no hassle - this is not for you.
Whence someone figures this out - I will gladly delete this review.
Written by a customer while visiting Garmin
Customer Rating
3
Good device, could use some additional features.
on May 12, 2026
Posted by: peterp
In general, I like the Index Sleep Monitor as it is more comfortable than wearing my Approach S70 watch while sleeping. One slightly annoying thing is that it takes a lot longer to sync its data to the Connect phone app in the morning compared to the watch. It would be even more useful if you could add the feature of getting notifications from my iPhone like the watch. I am hard of hearing and can hardly hear anything when I take my hearing aids out to sleep. It would be great for the sleep monitor to vibrate when I get a phone or facetime call on my phone.
Written by a customer while visiting Garmin
Customer Rating
2
Comfortable but Too Inconsistent to Recommend
on May 8, 2026
Posted by: Mehc
Bought the Garmin Index Sleep Monitor because I wanted to track sleep without wearing a watch and stay in the Garmin ecosystem (otherwise I probably would have gone with the Oura Ring).
Unfortunately, my experience has been disappointing so far. Pretty often the sleeve fails to record sleep entirely. I pay attention to fit, sensor position, placement, etc., and I still end up with a couple of failed nights per week.
The most frustrating part is the lack of meaningful feedback when it fails — there’s little to no explanation about what went wrong, so it’s hard to improve consistency.
To be fair, it’s very comfortable and unobtrusive when it works, which is exactly what I wanted. But in my case the reliability just hasn’t been there. Overall I’m disappointed and, based on my experience, I wouldn’t recommend it.
Written by a customer while visiting Garmin
Customer Rating
4
Helps
on May 6, 2026
Posted by: Ruko
was curious about what time i wake in the middle of the night and my breathing, and the length of sleep time..
Written by a customer while visiting Garmin
Customer Rating
4
Very comfortable HW - Addl SWFunctionality needed
on May 5, 2026
Posted by: Jon Paul
Epix gen 2 owner and the Sleep Monitor is much more comfortable to wear at night - it does its job well.
Would love to see some new features added
* In addition to setting alarms for specific times, would love to see the ability to set alarms for specific amounts of time - say 30 min for a nap, or 8 hours regardless of what time it is when I go to bed. (Thinking out loud - not just by wake-up time (7am) or length of time (8 hours), but by sleep need - Garmin connect has the information so why can't you determine when the user falls asleep and then calculate the right time to wake up?)
* Would love to see quick alarms that you can set once and then disappear after the alarm goes off - not every alarm needs to be saved.
* In addition to setting alarms for specific times, would love to see the ability to set alarms for specific amounts of time - say 30 min for a nap, or 8 hours regardless of what time it is when I go to bed. (Thinking out loud - not just by wake-up time (7am) or length of time (8 hours), but by sleep need - Garmin connect has the information so why can't you determine when the user falls asleep and then calculate the right time to wake up?)
* Would love to see quick alarms that you can set once and then disappear after the alarm goes off - not every alarm needs to be saved.
Written by a customer while visiting Garmin