What is considered excessive yawning?

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Tags

1. #yawning
2. #triggered
3. #excessive
4. #filling
5. #fatigue
6. #response
7. #minute
8. #involuntary
9. #natural
10. #deeply
11. #opening
12. #breathing
13. #occurs
14. #process
15. #mouth
16. #mostly
17. #being
18. #sleepiness
19. #tired
20. #lungs
21. #usually