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 1 month 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 21 days 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.

0 wojtek_b 14 days ago in reply to Louike

on every forum there needs to be someone to provide a story a type of: "I know it better, I used multi-million dollar devices, and what do you poor guy expect"

And I agree with you as I used fenix 3,5,6 and epix gen2 and gen2 pro - and these device had to identify when I go to sleep and when I wake up. And it dit it quite good. with ISM I have the feeling, I need to be very careful not to put to ISM to early. Thus when I go to bed and don't go to sleep immediately, I need to keep Epix on my wrist until the final decision to go to sleep :)

0 JustDave 1 day ago in reply to wojtek_b

Just ordered my ISM and had couple of questions... it sounds like you basically 'start' your sleep cycle by removing your Epix, yes? And that has proven to be the most reliable method? What about in the morning, does putting the watch back on trigger the end of the sleep mode? (I have noticed users stating that the "End Sleep" doesn't necessarily turn off the sleep mode)