Index Sleep Monitor

This sleep monitor gives you exactly what you need to track your sleep. Way better and way cheaper than the Oura Ring or the Whoop device. You pay one time and there are no subscriptions. Also, the material is very comfortable. I don’t even notice while Im sleeping.

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.

What device ! Very confortable and, I think more accurate then the watch sensor.

I really wanted this to work, but after more than a month of troubleshooting, I can’t recommend this product to most Garmin users. The only real positive: it is genuinely comfortable. If you hate sleeping with a watch on, this is well designed and easy to forget you’re wearing it. The major problem: functionality is extremely limited unless you own Garmin’s very latest watches (for example Fenix 8 and a small handful of newly released models). If you own anything older, including premium models like the Epix Pro Gen 2, the Index Sleep Monitor does not reliably integrate with core training metrics like Training Readiness and stress history. Sleep and HRV data may record, but critical components needed for Training Readiness frequently fail to sync or are ignored entirely. Garmin’s own forums are full of reports of missing sleep, missing recent stress, or incomplete readiness scores when using this device with anything other than their newest watches. What makes this especially frustrating is that Garmin does not clearly disclose these limitations anywhere in the product description. The marketing implies broad compatibility, but the reality is very different. You only discover this after weeks of trial and error, following complex sync rituals and workarounds provided by Garmin support. By the time it becomes clear that your watch is effectively unsupported, the return window has passed. This feels like a buyer beware situation. If you do not already own one of Garmin’s newest watch models with explicit, updated firmware support for the Index Sleep Monitor, this device is largely pointless. Comfort alone does not justify the price when the core promise of training integration does not work as advertised. Bottom line: comfortable, but functionally unreliable and poorly disclosed compatibility. Do not waste your money unless you own Garmin’s very latest watch models.

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 :)

I love this product. I’ve always had trouble wearing my Garmin watch in bed — it’s uncomfortable and often disrupts my sleep — and this completely solves that problem. The Garmin Index Sleep Monitor is lightweight, unobtrusive, and easy to forget you’re even wearing it. Despite that, it still delivers accurate and detailed sleep tracking that integrates seamlessly with the Garmin ecosystem. Setup was quick, syncing is reliable, and the data quality matches what I expect from Garmin. If you want high-quality sleep metrics without having to wear a watch overnight, this is an excellent solution. Highly recommended for anyone serious about sleep tracking but sensitive to wrist-based devices.

After a month of waiting for "engineering to review my ticket" , and me contacting them weekly, they finally offered a replacement. (April 2026) I just received my replacement device and wore it for the first time last night. Followed the Best Practices steps exactly. Woke up this morning, took it off, put it on the charger. Put on my watch. Waited 5 mins or so. No sync. Had to take it back off the charger, wake it up, open Garmin Connect, wait for it to actually connect, then force the sync. The morning report on the watch still wasn't right, it never got the sleep data. Oh, and as per usual, it recorded "no data" for skin temperature. I strongly suggest that anyone having issues with this submit a bug to Garmin. CALL them, do not just chat with them. I was told today that I'm the only report of "no data" for the skin temperature metric, so apparently people are just complaining and not actually calling Garmin and letting them know they're having problems. Or maybe it really is just me. I called again today, apparently the new index monitor I wore last night didn't upgrade itself to the latest software version, so I had to install Garmin Connect and force the update. Support suggested I wear it again for a few nights but honestly, I don't feel like dealing with the frustration. And because I foolishly purchased my original device here (and am now well past the return window), Garmin won't offer me any kind of credit, they'll only send replacements apparently. I love all my other Garmin devices but this one is a piece of junk, for sure.

Yes, it’s a comfortable arm band, but that’s about it. Sleep tracking is absolutely terrible. It cannot distinguish between times of low activity (such as when you’re reading in bed) and sleep and therefore gives you an incorrectly high sleep score. I bought it because I didn’t want to pay for it & wear my whoop 24/7 anymore, but it is a totally inferior product that is so inaccurate it will do nothing to assist you with training or recovery metrics.

Ich nutze den Garmin Sleepmonitor nun seit einiger Zeit, um meine Erholung genauer zu tracken und möchte hier meine Erfahrungen teilen. Für jeden, der seinen Schlaf optimieren möchte, ist dies eine Überlegung wert. 𝗚𝗲𝗻𝗮𝘂𝗶𝗴𝗸𝗲𝗶𝘁 & 𝗠𝗲𝘀𝘀𝘂𝗻𝗴 Der größte Vorteil gegenüber meiner Smartwatch am Handgelenk ist die Genauigkeit. Schon die Zeitpunkte für Schlafeintritt und Aufwachen sind bei meinen Aufzeichnungen mit dem Sleepmonitor genauer als mit der Smartwatch. DIe Daten zu den einzelnen Schlafphasen (Tiefschlaf, REM etc.) erscheinen mir plausibel. Als Sportler schätze ich zudem den genauen Blick auf die Herzfrequenzvariabilität (HFV). 𝗔𝗸𝗸𝘂𝗹𝗮𝘂𝗳𝘇𝗲𝗶𝘁 Laut Garmin beträgt die Akkulaufzeit bis zu 7 Tage. Diesen Wert erreiche ich bei meiner Schlafdauer nicht ganz, ich erreiche Laufzeiten von 5-6 Tagen. Eine eigene Anzeige für den Ladezustand hat der Sleepmonitor nicht, der Wert kann nur über die App eingesehen werden. 𝗨𝗻𝘁𝗲𝗿𝘀𝘁ü𝘁𝘇𝘂𝗻𝗴 𝗯𝗲𝗶 𝗱𝗲𝗿 𝗦𝗰𝗵𝗹𝗮𝗳𝘃𝗲𝗿𝗯𝗲𝘀𝘀𝗲𝗿𝘂𝗻𝗴 Die Auswertungen in der Garmin Connect App sind sehr detailliert und bieten echten Mehrwert. Ich konnte verschiedene Maßnahmen in meinem Alltag testen, die sich positiv auf meinen ‚Sleepscore‘ ausgewirkt haben. Das hat tatsächlich dazu beigetragen, meine Schlafqualität gezielt zu verbessern. 𝗛𝗶𝗻𝘄𝗲𝗶𝘀 𝘇𝘂𝗿 𝗚𝗿öß𝗲 Angaben von Garmin:: S–M: Für einen Oberarmumfang von 20 bis 29 cm L–XL: Für einen Oberarmumfang von 26 bis 42 cm Ein Tipp zur Passform: Mit meinem Umfang von etwas über 26 cm lag ich genau dazwischen und habe die L-XL-Variante gewählt. Sie passt, aber für einen etwas engeren Sitz würde ich mir ein Ersatzband in der kleineren S-M-Variante zulegen. 𝗙𝗮𝘇𝗶𝘁 Wer seinen Schlaf ernsthaft optimieren möchte und wem die Messung am Handgelenk zu ungenau oder nachts störend ist (wie es bei mir der Fall war), findet hier eine hervorragende Lösung. Eine klare Kaufempfehlung für alle Statistik-Fans und Gesundheitsbewusste!

Yo lo compré para tener métricos relacionados con mi sueño y así evaluar que tanto lo requiero para mis entrenamientos de sesiones largas al correr, así puedo ver si descanso suficientes y necesito más o si hay alguna alteración en mi cuerpo, además, la conexión es automática y rápida ya teniendo la aplicación garmin connect

Non riesco a dormire con l'orologio al polso e mi dispiaceva non poter accedere a tutte le metriche relative al sonno di Garmin che influenzano anche tutta una serie di parametri molto utili per l'allenamento, quindi ho comprato questa fascia. È molto comoda e morbida e ci dormo bene e adesso ho piena funzionalità delle metriche Garmin. Ottima!

Eu gostei bastante. Confortável para dormir e a sincronização é automática assim que tiro do braço. A bateria tem durado aproximadamente 6 dias