Garmin sleep Monitor, Lightweight Smart Band for Tracking Stages, Recovery, Up to 7 Nights Battery Life, S-M

It's very good. It works well, it feels well. One star off, as it would not pair. It took me some time to mess around with Bluetooth and the Connect app to make it work. It should have been another star off for a really high price but so far so good. It works well.

Updated: device does "settle down" and has actually becone fairly accurate (in line with other industry devices). Convenient as its worn a band. Not a bad device just a little high on the price side. Placeholder review: I'm sceptical. The device still uses the Garmin format of setting your "sleep window".The first night I tried to stick to the "window" to get a base set of data. The device did not record my sleep and wake time at all, I had to set it manually! The data between what I guestimated my actual fall asleep time was and wake time was recorded HRV etc but it feels to user dependent. I can go back at any time and edit the fall asleep and wake times. There is no device recorded start and finish it's bizarre

The monitor is very lightweight and is not uncomfortable to wear, even over extended periods and does not inhibit sleep. So why the 1 star? It does not work. Over 4 consecutive nights, the device only managed to detect and monitor 2 nights' sleep of ~1hr, so results (surprise, surprise!) Poor Sleep, despite me actually getting 8 hrs. It simply fails to accurately detect and monitor when you are actually asleep. Returned and refund requested

Does what it says on the tin, but if you're planning to use this alongside an existing Garmin watch make sure your watch has Body Battery TrueUp which is limited to newer models, or you'll get no stress and body battery data.