Adolescents living in homes without electric lighting have earlier sleep times.

@article{Peixoto2009AdolescentsLI,
  title={Adolescents living in homes without electric lighting have earlier sleep times.},
  author={Carina Aparecida Tardelli Peixoto and Adeline Gisele Teixeira da Silva and Mary A. Carskadon and Fernando Mazzilli Louzada},
  journal={Behavioral sleep medicine},
  year={2009},
  volume={7 2},
  pages={73-80}
}
The aim of this project was to compare circadian rhythmicity of a group of 37 adolescents (14 girls), aged 11 to 16 (mean age = 13.1 +/- 1.7 years), with and without electricity at home. Twenty students attended morning school (07:30-11:30), and 17 attended evening school classes (19:00-22:30). Eleven adolescents had no electric lighting at home (5 attended morning classes and 6 attended evening classes). They completed a sleep log and wore a wrist actigraph for 5 consecutive days. Saliva… CONTINUE READING