Associations between seasonal variations in day length (photoperiod), sleep timing, sleep quality and mood: a comparison between Ghana (5°) and Norway (69°).

@article{Friborg2012AssociationsBS,
  title={Associations between seasonal variations in day length (photoperiod), sleep timing, sleep quality and mood: a comparison between Ghana (5°) and Norway (69°).},
  author={Oddgeir Friborg and Bj\orn Bjorvatn and Benjamin Amponsah and St{\aa}le Pallesen},
  journal={Journal of sleep research},
  year={2012},
  volume={21 2},
  pages={176-84}
}
The hypothesis of whether day length (photoperiod) is an important zeitgeber (time-giver) for keeping the circadian rhythm entrained to a 24-hour cycle was examined, as was its association with sleep patterns and mood problems. Data were collected prospectively from a site with very large differences in daylight duration across seasons (Tromsø in Norway, 69°39'N) and a site with very small seasonal differences in daylight duration (Ghana in Accra, 5°32'N). Two hundred subjects were recruited… CONTINUE READING
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