Avoid blue light because it raises your cortisol and resting heart rate.
The evidence is convergent. Multiple independent sources reach the same conclusion, the underlying mechanism is well-characterized, and even the field's most cautious voices treat it as worth doing.
Avoid blue light because it raises your cortisol and resting heart rate.
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So I actually have some blue light that I can shine in my eyes to get my cortisol levels up, synthetic way, not naturally. But whatever you do, try to get some light early in the morning
the blue light in fact is is waking our body up it's giving you know the Circadian mechanism of it's morning time let's release cortisol
I woke up this morning, bright light exposure first thing in the morning, reset my circadian rhythm, elicit the cortisol response, right? Get that serotonin, inhibit melatonin.
10 minutes of bright outdoor light within the first hour of waking anchors the circadian phase and improves sleep onset that night.
Morning sunlight exposure shifts the cortisol awakening response forward, improving daytime alertness.
Long-term morning sunlight reduces age-related macular degeneration risk.
Sleep regularity predicts all-cause mortality more strongly than sleep duration.
Tracking deep sleep on a wearable accurately reflects EEG-measured slow-wave sleep.
Caffeine has a half-life long enough that consumption after 2pm measurably degrades deep sleep in slow metabolizers.