After two nights of limited sleep, people exposed to light that mimics a natural sunrise have higher cortisol levels when they wake up compared to those exposed to blue light or dim light.

37

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Against

Evidence from Studies

Supporting (1)

37

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37

Effects of Artificial Dawn and Morning Blue Light on Daytime Cognitive Performance, Well-being, Cortisol and Melatonin Levels

Randomized Controlled Trial

Human

2013 Oct

When people wake up after not sleeping enough, a special morning light that slowly gets brighter (like a fake sunrise) makes their body more alert faster than blue light or dim light—this is shown by higher levels of a stress hormone called cortisol right when they wake up.

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Source Study

Effects of Artificial Dawn and Morning Blue Light on Daytime Cognitive Performance, Well-being, Cortisol and Melatonin Levels

Score: 37

DOI: 10.3109/07420528.2013.793196

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In healthy adults who have had limited sleep, exposure to a simulated sunrise light before waking may improve how good they feel, compared to exposure to dim light or blue light.

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In healthy adults who slept only six hours for two nights, exposure to blue light in the morning helped maintain cognitive function, while light that mimicked dawn improved it further, compared to dim light, which caused a decline in performance.

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