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={Thomas Kantermann and Myriam Juda and Martha Merrow and Till Roenneberg},
  journal={Current Biology},
  year={2007},
  volume={17},
  pages={1996-2000}
}

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References

SHOWING 1-10 OF 32 REFERENCES
Epidemiology of the human circadian clock.
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.
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.
A Functional analysis of circadian pacemakers in nocturnal rodents
TLDR
Indications are found that the response to a resetting stimulus at a given phase of the rhythm is correlated with the individual, and the functional meaning of the interrelationships of τ and PRC is briefly discussed.
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.
A functional analysis of circadian pacemakers in nocturnal rodents
TLDR
The model qualitatively accommodates the interdependence of τ and α summarized in Aschoffs Rule and shows that both the split and the unsplit condition are metastable states, characterized by different phase relationships (ψEM) of two constituent oscillators.
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.
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.
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.
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.
...
...