Can morning light make you feel better when you're tired?
Effects of Artificial Dawn and Morning Blue Light on Daytime Cognitive Performance, Well-being, Cortisol and Melatonin Levels
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
Surprising Findings
Cognitive performance improved under dawn-simulating light — not just stabilized — while it declined under dim light.
Most assume sleep deprivation permanently impairs cognition until you sleep — but this shows the right morning light can reverse the decline, even after just two nights of poor sleep.
Practical Takeaways
Use a dawn-simulating lamp (gradual 0–250 lux) for 50 minutes before waking if you're sleep-deprived to improve mood and focus.
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
Surprising Findings
Cognitive performance improved under dawn-simulating light — not just stabilized — while it declined under dim light.
Most assume sleep deprivation permanently impairs cognition until you sleep — but this shows the right morning light can reverse the decline, even after just two nights of poor sleep.
Practical Takeaways
Use a dawn-simulating lamp (gradual 0–250 lux) for 50 minutes before waking if you're sleep-deprived to improve mood and focus.
Publication
Journal
Chronobiology International
Year
2013
Authors
V. Gabel, Micheline Maire, C. Reichert, S. Chellappa, C. Schmidt, V. Hommes, A. Viola, C. Cajochen
Related Content
Claims (4)
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.
In healthy adults who have had limited sleep for two nights, exposure to blue light in the morning may shift the timing of melatonin release to occur earlier than when exposed to dawn-like or dim light.
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.
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.