Is sleeping in complete darkness better?

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Tags

1. #hours
2. #duration
3. #levels
4. #sleep
5. #exposure
6. #shown
7. #shortens
8. #compared
9. #usual
10. #melatonin
11. #studies
12. #during
13. #minutes
14. #addition
15. #significant
16. #about
17. #bedtime
18. #before
19. #light
20. #indeed
21. #suppresses