The Human Circadian Clock's Seasonal Adjustment Is Disrupted by Daylight Saving Time

@article{Kantermann2007TheHC,
  title={The Human Circadian Clock's Seasonal Adjustment Is Disrupted by Daylight Saving Time},
  author={T. Kantermann and M. Juda and M. Merrow and T. Roenneberg},
  journal={Current Biology},
  year={2007},
  volume={17},
  pages={1996-2000}
}
A quarter of the world's population is subjected to a 1 hr time change twice a year (daylight saving time, DST). This reflects a change in social clocks, not environmental ones (e.g., dawn). The impact of DST is poorly understood. Circadian clocks use daylight to synchronize (entrain) to the organism's environment. Entrainment is so exact that humans adjust to the east-west progression of dawn within a given time zone. In a large survey (n = 55,000), we show that the timing of sleep on free… Expand
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