The influence of light on our body’s internal rhythms, especially in the evening, has fascinated researchers. We know that short-wavelength light can impact our circadian rhythm, influencing both sleep and alertness. However, the specific mechanisms driving these effects have remained elusive. While melanopsin-expressing retinal ganglion cells are believed to be the primary drivers, the involvement of color-sensitive cones has been less certain. This study aims to untangle this mystery by investigating whether the mechanisms of color vision contribute to shaping the human circadian system and the resulting patterns of sleep.

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