Getting blue light, especially from the sun, in the daytime helps you stay alert while improving performance and mood ( 11).īlue light therapy devices may help treat depression, and blue light bulbs have been shown to reduce fatigue and improve the mood, performance, and sleep of office workers ( 12, 13, 14). Keep in mind that sunlight and white light contain a mixture of various wavelengths, each of which has a significant amount of blue light ( 10). However, your circadian rhythm needs signals from the external environment - most importantly daylight and darkness - to adjust itself.īlue-wavelength light stimulates sensors in your eyes to send signals to your brain’s internal clock. Most importantly, it determines when your body is primed for being awake or asleep ( 9). Your body has an internal clock that regulates your circadian rhythm - the 24-hour biological cycle that influences many internal functions ( 8).
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