Sleep
Light Entrainment
Light entrainment uses timed bright and dim light to shift circadian rhythm—key for jet lag, chronotypes, and fixing delayed sleep patterns.
Light entrainment is using timed bright light—morning outdoor sun or a 10,000-lux lamp—and evening dimness to shift circadian phase. Travelers use it for jet lag; delayed sleepers need morning light, advanced types need evening light carefully.
Consistency for several days beats one-off exposure. Pair with fixed wake times and less late blue light.
Common questions
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How long should morning light exposure be?
Fifteen to thirty minutes of outdoor light or a 10,000-lux lamp within an hour of waking is a common starting point for several consecutive days.
Related terms
Put Light Entrainment into practice
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