# Evening use of light-emitting eReaders negatively affects sleep, circadian timing, and next-morning alertness

Chang AM, Aeschbach D, Duffy JF, Czeisler CA · PNAS 112(4):1232–1237 · 2015



## 核心发现

睡前用发光设备阅读，与读纸质书相比会延迟褪黑素、延长入睡时间并降低次日清晨的警觉度。



[阅读原文](https://pubmed.ncbi.nlm.nih.gov/?term=Evening+use+of+light-emitting+eReaders+negatively+affects+sleep,+circadian+timing,+and+next-morning+alertness)

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SleepShred for iPhone: https://apps.apple.com/app/id6802040541