Sleep
Outdoor Light Exposure
Outdoor light exposure soon after waking anchors circadian rhythm and evening melatonin. Brief bright morning light beats indoor bulbs for phase setting.
Outdoor light exposure within an hour of waking sets circadian phase, cortisol timing, and evening melatonin onset. Bright sky light—even on cloudy days—beats desk lamps for lux levels.
Pair with a dim, screen-light wind-down at night. Ten to twenty morning minutes anchor most schedules.
Common questions
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Is a light box as good as outdoor light?
High-lux therapy lamps help when sun is scarce, but outdoor broad-spectrum light remains the default anchor when available. Use both in dark winters if needed.
Related terms
Put Outdoor Light Exposure into practice
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