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
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
Customer Rating
3
Not up to Garmin's usual standard!
on July 18, 2026
Posted by: Jacky2
This is not a new device. About every 2-3 months it will not link up with Garmin Connect, and the only way I can get it back on line is to disconnect the device so it is no in Garmin Connect, then have it find the device again. I have a number of Garmin devices (computer, radar/camera/light, camera/front light, scale, blood pressure) and Garmin usually does not have this sort of problem. Battery life is also low for something from Garmin, typically 3 nights.
Written by a customer while visiting Garmin
Customer Rating
3
on July 15, 2026
Posted by: Lewistheone
Need more detailed instructions for all basic functions of the device
Written by a customer while visiting Garmin
Customer Rating
2
Does it's job, but with some real drawbacks
on July 8, 2026
Posted by: digitallogic
After a couple of weeks, I'm pretty underwhelmed. I like the form factor for sleeping. My Fenix 7 has been giving me issues at night, I wake up with pins and needles in my hand sometimes. This has totally solved it, at a price:
1. The alarm has woken me up about 75% of the time. I've missed a few workouts, but haven't been late to work. Suspect I'll be really bitten by this at some point.
2. Every single morning, the morning report on my watch is missing half its data for 15 mins to an hour. Sometimes there's no sleep data. Sometimes no HRV. Sometimes neither. Losing either of these means that other morning report pages, like Training Readiness and Body Battery, are also screwed up. Note, I'm not having the "data never syncs" issues other reviews have reported. They eventually sync, but usually sometime after I've started my day. If you like/rely on the morning report on your watch, using this device for sleep data will break it.
3. You can't engage with the device's alarms unless it's paired to your phone. The device sleeps all day w/o a connection, so you can't see what alarm is set, or set a new one, unless you go to the device and wake it up. Eg - I'm sitting on the couch and realize I need to wake up early. With my watch, I'd just set an alarm. I have my phone on me, but that's useless since the device is asleep/not connected. So I have to walk upstairs, wake the device, wait for it to connect, then set an alarm. I don't know why I can't specify an alarm on my phone w/o the connection, and have it set after I grab the device before bed.
4. Similarly, if you don't sleep with your phone within reach (highly recommend), if you go to bed then realize you need to set an alarm, you have to get up and go grab your phone to set one. Don't see any way around this as it is a "configure from your phone" only device, but it's annoying.
5. I get about 7 days of battery life, which is what was advertised. But, given the size of the device, it feels crazy that it doesn't get more.
6. I've had a couple of nights where I absentmindedly put on the sleep band but forgot to take off my watch. Would be nice for the watch to give me a poke in this case. Or maybe a notification in the app?
7. Had one instance of needing to delete the device from the mobile app and re-pair it within the first two weeks. Hopefully that was a fluke, and I don't need to do that every few weeks.
8. The alarm uses 2 taps to stop, and 4 taps to snooze. I find this backwards. I snooze at least once every day, sometimes twice. Why does that take more steps?
2. Every single morning, the morning report on my watch is missing half its data for 15 mins to an hour. Sometimes there's no sleep data. Sometimes no HRV. Sometimes neither. Losing either of these means that other morning report pages, like Training Readiness and Body Battery, are also screwed up. Note, I'm not having the "data never syncs" issues other reviews have reported. They eventually sync, but usually sometime after I've started my day. If you like/rely on the morning report on your watch, using this device for sleep data will break it.
3. You can't engage with the device's alarms unless it's paired to your phone. The device sleeps all day w/o a connection, so you can't see what alarm is set, or set a new one, unless you go to the device and wake it up. Eg - I'm sitting on the couch and realize I need to wake up early. With my watch, I'd just set an alarm. I have my phone on me, but that's useless since the device is asleep/not connected. So I have to walk upstairs, wake the device, wait for it to connect, then set an alarm. I don't know why I can't specify an alarm on my phone w/o the connection, and have it set after I grab the device before bed.
4. Similarly, if you don't sleep with your phone within reach (highly recommend), if you go to bed then realize you need to set an alarm, you have to get up and go grab your phone to set one. Don't see any way around this as it is a "configure from your phone" only device, but it's annoying.
5. I get about 7 days of battery life, which is what was advertised. But, given the size of the device, it feels crazy that it doesn't get more.
6. I've had a couple of nights where I absentmindedly put on the sleep band but forgot to take off my watch. Would be nice for the watch to give me a poke in this case. Or maybe a notification in the app?
7. Had one instance of needing to delete the device from the mobile app and re-pair it within the first two weeks. Hopefully that was a fluke, and I don't need to do that every few weeks.
8. The alarm uses 2 taps to stop, and 4 taps to snooze. I find this backwards. I snooze at least once every day, sometimes twice. Why does that take more steps?
Pros:
1. I find the band very comfortable. I've seen other people complain about it, but I suspect most of them are over tighting it. I leave it fairly loose, to the point that it can move a bit throughout the night, and this hasn't caused any issues.
2. Totally fixed the issue my watch was causing during sleep.
3. I get a 10-15 point increase in my sleep score versus my watch, lol.
4. It is very easy to sleep with. I mostly forget it's there in a way I can't with a watch.
1. I find the band very comfortable. I've seen other people complain about it, but I suspect most of them are over tighting it. I leave it fairly loose, to the point that it can move a bit throughout the night, and this hasn't caused any issues.
2. Totally fixed the issue my watch was causing during sleep.
3. I get a 10-15 point increase in my sleep score versus my watch, lol.
4. It is very easy to sleep with. I mostly forget it's there in a way I can't with a watch.
Written by a customer while visiting Garmin
Customer Rating
2
It wasn’t uncomfortable to wear
on July 5, 2026
Posted by: Bear2027
I bought it because I didn’t feel my watch was giving me accurate information as it ends up. I don’t really think that addition of an arm band is helped improve the interpretation of my sleep.
Written by a customer while visiting Garmin
Customer Rating
2
Difficult to know if device is working
on July 5, 2026
Posted by: Monty23
It has worked most of the time for me. Manual and Garmin tutorial video are not clear as to how to use it. The tutorial says to hold your finger over the sensor to wake the device before sleep. It says, "the light will flash white to let you know it is booting, then purple and vibrate to let you know it is ready to go."
This does not happen. I have no idea how to tell if the device has started.
Most of the time it tracks sleep. Sometimes it starts itself at 3am many hours after I have fallen asleep.
It seems so odd to me that starting the device is so vague and unclear.
Written by a customer while visiting Garmin
Customer Rating
1
on July 2, 2026
Posted by: tpc63
I can't get it to read correctly always stops on my first bathroom break or never starts.
Written by a customer while visiting Garmin
Customer Rating
4
neophyte
on July 1, 2026
Posted by: jimms
It seems to be more sensitive and accurate that the watch, but it's still too early to tell if the data will be helpful
Written by a customer while visiting Garmin