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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References

SHOWING 1-10 OF 32 REFERENCES
Epidemiology of the human circadian clock.
TLDR
An algorithm is established which optimises chronotype assessment by incorporating the information on timing of sleep and wakefulness for both work and free days, because sleep duration strongly depends on chronotype. Expand
Life between Clocks: Daily Temporal Patterns of Human Chronotypes
TLDR
It is predicted that the timing of sleep has changed during industrialization and that a majority of humans are sleep deprived during the workweek, and the implications are far ranging concerning learning, memory, vigilance, performance, and quality of life. Expand
The Human Circadian Pacemaker Can See by the Dawn's Early Light
TLDR
The findings suggest that a naturalistic dawn signal is sufficient to forestall this natural delay drift and Zeitgeber transduction and circadian system response are hypothesized to be tuned to the time-rate-of-change of naturalistic twilight signals. Expand
A Functional analysis of circadian pacemakers in nocturnal rodents
Summary1Phase response curves for 15′ bright light pulses of four species of nocturnal rodents are described. All show delay phase shifts early in the subjective night, advance shifts in the lateExpand
Adjusting to the changes to and from Daylight Saving Time
TLDR
It is found that significant disruptions of behaviour occur during adaptation to the time change, and the adoption of Daylight Saving Time is another possible cause of disruption. Expand
Dose-response relationships for resetting of human circadian clock by light
TLDR
It is reported here that light of even relatively low intensity significantly phase-shifts the human circadian pacemaker, demonstrating that humans are much more sensitive to light than initially suspected and support the conclusion that they are not qualitatively different from other mammals in their mechanism of circadian entrainment. Expand
Transition into daylight saving time influences the fragmentation of the rest-activity cycle
TLDR
Transition into daylight saving time may have a disruptive effect on the rest-activity cycle in those healthy adults who are short-sleepers or more of the evening type. Expand
Annual Rhythm of Human Reproduction: II. Environmental Correlations
TLDR
It is shown for the first time on a global scale that photoperiod, as shown for many animals, may also influence the physiology of human reproduction, and temperature and the specific changes in their impact can account for several features of the annual human conception rhythm. Expand
Season- and Latitude-Dependent Effects of Simulated Twilights on Circadian Entrainment
TLDR
Exposure to low twilight illuminances alone can account for several of the documented differences between the effects of natural and rectangular light cycles on circadian entrainment. Expand
Annual Rhythm of Human Reproduction: I. Biology, Sociology, or Both?
TLDR
The seasonal component in human reproduction is based on biological factors, and the phase of the rhythm depends on latitude, with a 6-month difference between the Northern and Southern Hemispheres. Expand
...
1
2
3
4
...