ND-0696 · 2015 · Other
Evening use of light-emitting eReaders negatively affects sleep, circadian timing, and next-morning alertness
Chang AM et al. PNAS. 2015.
doi.org/10.1073/pnas.1418490112 · Finding checked against the abstract
Source details checked refers to publication information or an official source page. See the record’s limitations for incomplete extraction and the method for how to read the labels.
What the source reports
Reading a light-emitting eBook before bed, against a printed book, delayed sleep onset, suppressed melatonin, shifted the circadian clock later and reduced alertness the next morning.
Design questions and applications
Limit bright screens and light in bedrooms in the evening.
Field
Light and circadian
Notes and follow-up
Added from the Corpus Desk (card chang-2015-ereaders) on 2026-11-09; the card finding was rewritten from the abstract. Evidence strength and translation distance not yet rated. WELL label held for review.
indexed under
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