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Computer

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Across
  1. 2. something that shines
  2. 3. screen emits blue light
  3. 5. something that our bodies produce
  4. 8. system our biological clock
  5. 9. an idea
  6. 11. something that makes us sick
  7. 13. a sickness
  8. 14. a type of light
  9. 18. when there is no light
  10. 20. comes from the sun or bulbs
  11. 21. light the light that keeps us awake
  12. 22. when you are on the internet
Down
  1. 1. when we are not asleep
  2. 4. widespread sickness
  3. 6. how much light something has
  4. 7. when something effects you
  5. 10. a person who studies about things
  6. 11. causes cancer
  7. 12. what helps to sleep
  8. 15. when you type on your phone
  9. 16. book does not emit blue light
  10. 17. what we our bodies need to rest
  11. 19. phones emits blue light
  12. 21. light keeps us awake