Is yawning a sign of lack of oxygen to the brain?

Related questions

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6. What is the best treatment for wheezing?
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Tags

1. #because
2. #internal
3. #hypothalamus
4. #oxygen
5. #evidence
6. #tired
7. #brain
8. #paraventricular
9. #nucleus
10. #another
11. #levels
12. #communicating
13. #environmental
14. #hypothesis
15. #bored
16. #yawning
17. #changing
18. #means
19. #conditions
20. #others
21. #still
22. #induce
23. #suggests