How does Fitbit know I'm sleeping?

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Tags

  1. #those
  2. #morning
  3. #device
  4. #measure
  5. #using
  6. #fitbit
  7. #movements
  8. #sleep
  9. #translates
  10. #jawbone
  11. #monitors
  12. #method
  13. #called
  14. #order
  15. #track
  16. #software
  17. #actigraphy