Why do I sleep with the light on?

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Tags

1. #hours
2. #brain
3. #light
4. #hormone
5. #starts
6. #three
7. #travels
8. #begins
9. #about
10. #melatonin
11. #sleep
12. #release
13. #controls
14. #hypothalamus
15. #necessary
16. #through
17. #evening
18. #ready
19. #signal