Sleep
Blue Light Morning Exposure
Blue light morning exposure from outdoor sun or bright morning desks anchors circadian rhythm—paired with evening dimming, not bright late screens.
Blue light morning exposure from outdoor sun or a bright desk by a window anchors circadian phase—complement to evening dimming and screen curfews. Ten to thirty minutes soon after wake supports alertness without extra caffeine.
It does not justify bright screens at night.
Common questions
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Can a sunrise alarm replace outdoor light?
Bright alarms help waking but outdoor photons are stronger anchors. Use both—alarm to rise, then a short walk or window light within an hour.
Related terms
Put Blue Light Morning Exposure into practice
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