While this band is much more comfortable than sleeping with your Garmin wrist device overnight, it fails to live up to the core promise Garmin makes: it does not contribute to the physiological model your watch creates, so you end up having your watch's model and the sleep band's model that are disconnected. Body Battery, HRV Status, Training Status, and V02 Max had to completely reset when I started wearing this, and it wasn't until I dug deeper that I learned that the watch and sleep band don't work together to create a model – they create separate models. Until Garmin creates a better device ecosystem where their devices work together to create the physiological model, I'll be considering this sleep band a waste of money and would not recommend that anyone relying on Garmin for data on training progress. If you're casually tracking your body data and are not relying on the model for training, it could work just fine but I would advise leaving the watch on at night and putting it on in the morning while you still have the sleep band on so they both sync with the Connect app before removing the sleep band. Garmin – please fix your device ecosystem or give more clear information that the devices work to SEPARATELY track physiological data rather than working TOGETHER to create a comprehensive model.

I bought this hoping for better results and I find the results to be more consistent than the Fenix watch. I have no way to determine the accuracy. It is certainly comfortable to wear to bed. The shortcoming seems to be battery life; I am recharging every 4-5 days. You would think that Garmin could have designed this with a longer lasting battery.

Before the sleep monitor, I slept with my Garmin watch to track my sleep. The strap of the sleep monitor is definitely more comfortable to sleep with and makes sure you're not hurting anyone during the night 🙂 This is a positive, but is it enough to shelve out $170? I am a bit on the fence there. I would have expected more data, more analysis. Maybe because the sleep monitor is new, this is still all to follow. I wonder also why the monitor is only for sleep, and not to wear continuously to monitor heart rate and activities during the day. Charging the device is another headache. While it works fairly okay for the watch, it's a headache for the monitor. I have 2 cables and have to try my luck entering the cable until the green light flashes
So 2 stars, because it is a solid product and does well for what it is being sold and doesn't charge well. No 5 stars, because of the limited use of the monitor

I have sleep apnea and vestibular migraines which can be triggered by lack of quality sleep. My CPAP machine only tells me how long I've been in bed with the machine on, not how long I have been asleep. I had a SleepOn ring for almost 3 years before the battery wouldn't last through the night anymore. I do NOT want to pay hundreds of dollars a year on a subscription so this seemed like the best choice. Things I like about the Index Sleep Monitor: From a well reputable company; the device goes around my arm so it makes washing my hands easier when I get up to go to the bathroom; no subscription fees; reasonably priced compared to the competition; good battery life, which means fewer charge cycles per year and hopefully longer life than my SleepOn ring. I'm still getting used to the app but it provides me the information that I want and syncing with my iPhone is fast and easy.

First, I'm a sleep nerd. At least my wife calls me that. I wear a lot of sleep trackers to bed, including the Wellue 02 ring, Oura, and Whoop. Now I've added this to my repertoire, although it's overkill.

What it's accurate on: HRV, and SP02 (although it only monitors your oxygen levels every minute – which is significantly better than only Oura, which does a snapshot like every 15 minutes and therefore will miss any potential breathing events.

Also – I find the breathing variations to be accurate and in-line with my Wellue 02 ring.

Comfort – a major plus, especially on nights I forget to wear my 02 ring. It will let me know with very good accuracy on nights that I have some breathing disturbances and signs of mild sleep apnea (which, are usually nights I drink alcohol).

Last positive: battery life is truly 6-7 days.

Now for the negatives: Sleep stages I would not rely on. It does ok with deep sleep but overestimates in most situations. I am also wearing an Oura and Whoop and they both are usually in sync and this is not in sync most of the time with those two – which in my opinion are probably the ones to go off of (but I am asleep so therefore it's truly hard to say).

Also – syncing is a major issue. In fact, there are nights it simply doesn't even record my sleep. Or if it does, it ends up showing up much later in the day. This continues to be an issue about once per week.

I do not wear a Garmin watch. The app is still useful. I wear the Apple but take it off at night in favor of the Whoop. For most people, this will be a more than suitable sleep tracker and will give you reliable HRV, and more importantly, give you insights into potential breathing disturbances you may be unaware that you have. For me, this is a secondary device that ends up as a 4th tracker at night, and the majority of people use one / two trackers at the very most, not four like me. That's why I'm the sleep nerd 🙂