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LIGHT EXPOSURE AND CIRCADIAN RHYTHM
Our internal circadian rhythm (also called the circadian clock) is the engine
behind our sleep-wake cycle and is itself governed by light exposure. But not
all light exposure is equal: the light intensity (or lux) and timing of light
exposure impacts circadian rhythm quite differently. For instance, morning light
— especially the first natural light of the day — is a powerful wake-up signal
due to the ratio of blue light to yellow light that is unique to sunrise and
sunset. Additionally, outdoor light exposure can be upwards of ten times
brighter than the brightest indoor lighting, creating a much stronger
synchronization between your internal clock and the time of day.
At the same time, exposure to bright light, particularly blue light from screens
and artificial light late at night, will lead to circadian disruption. Shift
work, jet lag, rapid time zone changes, and an inconsistent sleep schedule cause
a misalignment between the light levels hitting the photoreceptors in our
retinas and the body’s other biological signals for sleepiness including
increased melatonin levels and a decrease in body temperature.
The effects of light on our circadian rhythm extend beyond mere sleep timing.
Even mild to moderate sleep deprivation has been linked to mental health issues
and temporary declines in cognitive functioning. Therefore, regulating our
exposure to different light sources throughout the day is a key strategy in
promoting overall mental and physical health and performance.
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SUB-TOPICS
The Science of Light Exposure and Circadian Rhythm
Circadian Rhythm: Lifestyle, Behavioral and Environmental Influences
Circadian Rhythm and Overall Health
How to Support and Synchronize Your Circadian Rhythm
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CIRCADIAN RHYTHM: LIFESTYLE, BEHAVIORAL AND ENVIRONMENTAL INFLUENCES
CIRCADIAN RHYTHM: LIFESTYLE, BEHAVIORAL AND ENVIRONMENTAL INFLUENCES -
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2. 01:55:25 Our Seasonal Rhythms: Mood, Depression, Lethargy & Reproduction
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October 25, 2021
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CIRCADIAN RHYTHM AND OVERALL HEALTH
1. Using Light (Sunlight, Blue Light & Red Light) to Optimize Health
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