Home Lighting Before Usual Bedtime Impacts Circadian Timing: A Field Study

Subjects averaged a 1:03 hour later melatonin onset after maximizing evening light exposure.

• Evening light exposure before bedtime can influence circadian timing.
• Subjects achieved an average light intensity of approximately 65 lux when maximizing home lighting.
• Minimizing light exposure resulted in an average intensity of about 3 lux.
• Participants went to bed approximately 14 minutes later during the week of maximum light exposure compared to the week of minimum light exposure.
• Every subject experienced a delayed melatonin onset after a week of increased evening light.

AI simplified