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. 2023 Dec 11;46(12):zsad114.
doi: 10.1093/sleep/zsad114.

In the light: towards developing metrics of light regularity

Danielle A Wallace  1   2
Affiliations

In the light: towards developing metrics of light regularity

Danielle A Wallace. Sleep. .
No abstract available

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Figures

Figure 1.
Figure 1.
Example graph showing light data collected across 5 days (with a full day from 12:00 am—12:00 am) using an ActiWatch Spectrum (lux represented by black lines); raw white lux data have been log-transformed for ease of plotting. Dashedhorizontal line indicates an illuminance threshold at 100 lux; to dichotomize data, lux values <100 are transformed to 0, while lux values ≥100 are transformed to 1. The solid line for each day represents the daily photoperiod at the 100 lux illuminance threshold, and the vertical line in the center of the daily photoperiod represents the daily Mean Light Timing at the 100 lux illuminance threshold (MLiT100).
See this image and copyright information in PMC

References

    1. Borbély AA, Daan S, Wirz-Justice A, Deboer T.. The two-process model of sleep regulation: a reappraisal. J Sleep Res. 2016;25(2):131–143. doi: 10.1111/jsr.12371 - DOI - PubMed
    1. Rahman SA, St Hilaire MA, Chang A-M, et al. . Circadian phase resetting by a single short-duration light exposure. JCI Insight. 2017;2(7):e89494. doi: 10.1172/jci.insight.89494 - DOI - PMC - PubMed
    1. St Hilaire MA, Gooley JJ, Khalsa SBS, Kronauer RE, Czeisler CA, Lockley SW.. Human phase response curve to a 1 h pulse of bright white light. J Physiol (Lond). 2012;590(13):3035–3045. doi: 10.1113/jphysiol.2012.227892 - DOI - PMC - PubMed
    1. Patke A, Young MW, Axelrod S.. Molecular mechanisms and physiological importance of circadian rhythms. Nat Rev Mol Cell Biol. 2020;21(2):67–84. doi: 10.1038/s41580-019-0179-2 - DOI - PubMed
    1. Nordhaus WD. Do real-output and real-wage measures capture reality?the history of lighting suggests not. In: Bresnahan TF, Gordon RJ, eds. The Economics of New Goods. Chicago, IL: University of Chicago Press; 1996:29–70.