ナショナルジオグラフィックのインスタグラム(natgeo) - 7月27日 03時51分

Photo by @magnuswennman How do our brains know when it is time to sleep? Why do we get tired? Why do we feel awake? Much of the reason comes down to light. Steven Lockley’s lab at Brigham and Women’s Hospital in Boston studies how specific wavelengths of light falling on the eye affect our brain, our behavior, and our physiology—for example, by resetting our 24-hour circadian clock. Light rich in blue wavelengths promotes alertness and is good in daytime. Redder light is best at night because it has less power to alert the brain or reset the biological clock.

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