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