How does Garmin track REM sleep?

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Tags

1. #garmin
2. #muscle
3. #prepares
4. #important
5. #information
6. #processing
7. #forming
8. #movement
9. #analyze
10. #heart
11. #devices
12. #memories
13. #sleep
14. #measurements
15. #movements
16. #activity
17. #start