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