How does Snapchat know you are sleeping?

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Tags

1. #while
2. #asleep
3. #looks
4. #based
5. #state
6. #which
7. #seemingly
8. #knows
9. #actionmoji
10. #uncomfortable
11. #pretty
12. #appear
13. #standing
14. #sleepy
15. #inactivity
16. #sleeping
17. #armchair
18. #snapchat
19. #people
20. #duration