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The inner clock — blue light sets the human rhythm
Wahl S, Engelhardt M, Schaupp P, Lappe C, Ivanov IV · Journal of Biophotonics 12(12):e201900102 · 2019
Key finding
Review of how short-wavelength light drives melanopsin signalling — the (smaller) light component of the screen problem.
Citation
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Evening use of light-emitting eReaders negatively affects sleep, circadian…Reading on a light-emitting device before bed delayed melatonin, lengthened sleep onset and reduced next-morning alertness vs a printed book.Bedtime mobile phone use and sleep in adultsPhone use after lights-out was linked to later bedtimes, longer sleep latency, more fatigue and worse sleep quality in adults."To sleep, perchance to tweet"In-bed social media use was associated with insomnia symptoms and anxiety — engagement, not just light.Association between portable screen-based media device access or use and sleep…Even access to a device in the bedroom (not just use) doubled the odds of inadequate sleep.
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