How does a swift sleep while flying?

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Tags

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  2. #swifts
  3. #lives
  4. #horizontal
  5. #sleep
  6. #other
  7. #caught
  8. #speed
  9. #except
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  11. #flying
  12. #spend
  13. #maximum
  14. #often
  15. #flight
  16. #drink
  17. #spends
  18. #insects
  19. #living