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Neuroscience of a High Performing Brain (Part 1): Sleep, Trackers, Cortisol, Blue light, Nootropics and a look at Angela’s Brain with Dr Andrew Hill

High Performance Health

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Intensity Over Color: Light's True Impact on Circadian Rhythm

The intensity of evening light significantly affects circadian rhythm, while the color of light, including blue light, does not. The brain is particularly insensitive to blue light in the evening since it typically isn't present during that time. The critical window for light's influence on circadian rhythms occurs from half an hour before to one hour after sunrise, as this is when the brain registers light cues. Outside this window, light doesn't communicate circadian information to the brain, indicating that morning light is essential for sync rather than protection against evening blue light. Furthermore, the human body can handle up to an hour of circadian disruption without substantial issues, allowing for short-term exposure to screens before bed without severe consequences on sleep timing.

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