What does arousal mean in a sleep study?

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Tags

1. #disruptions
2. #registered
3. #referred
4. #arousal
5. #index
6. #number
7. #though
8. #their
9. #likely
10. #frequency
11. #sleep
12. #people
13. #reported
14. #total
15. #higher
16. #which
17. #arousals
18. #tired
19. #study
20. #awakenings
21. #tolerance