Why hay fever is worse at night?

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Tags

1. #seasonal
2. #weeds
3. #surprisingly
4. #evening
5. #people
6. #suffering
7. #throughout
8. #night
9. #possibly
10. #allergy
11. #hours
12. #fever
13. #associated
14. #grass
15. #exposure
16. #because
17. #trees
18. #pollen