end of sleep - how the device knows? or actually dont?

A phone call woke me up today at 8. But I remained in bed, lying, browsing instagram till 9:15. At 9:15 I took of the ISM and put on my epix. Then I looked into connect to see my sleep ended at 9:15 according to garmin.

Does it mean, the almost 150€ high end device which only purpose is to monitor my sleep quality, stages ect. actually does recognize end of the sleep only by taking off the device? In such case, how can it recognize my sleep stages, as it cannot distinguish between sleep/no-sleep?

0 RD 15 days ago

The device is inferring your sleep stages based on a number of metrics, but presumes that you're sleeping (or trying to) while wearing it unless there's significant movement (getting up and walking around), or a large change in heart rate/breath/stress).

Short of you wearing a device that monitors brain activity, the level of sophistication you're hoping for will be imperfect. It is moderately accurate, but only under the expected condition that you're wearing it while sleeping.

You'll have a better experience if you instead adjust your expectation and habits slightly to conform with the limitations of the available technology that exists in wearables capable of tracking sleep.

I've tried countless devices for tracking sleep in the last decade and the Sleep Index is so far the most consistently accurate, it has the highest resolution data sampling for inference, and is the most comfortable sleep wearable I've ever owned. It balances theses things better than any other device in the sub $2000 range.

But maybe I've missed something? If you can suggest something that's doing it better, by all means please do!

0 Louike 1 day ago in reply to RD

I disagree with your story, the index sleep seems to just mostly assume you are asleep. The watches i have owned do a better job in calculating awakeness and falling asleep. I beleive garmin can do a better job calculating metrics of this device since its on the upper arm instead of the wrist.