Electric lighting, adolescent sleep and circadian outcomes, and recommendations for improving light health

Reduced light exposure during the school day may delay the circadian clock for adolescents.

• Chronic disruption to circadian physiology is associated with reduced daytime light and increased evening light exposure.
• Developmental changes in sleep-wake physiology suggest adolescents are particularly affected by poor light exposure patterns.
• Longer exposure to light-emitting devices in the evening is linked to suppressed melatonin production.
• Evening home lighting can also suppress melatonin secretion, potentially delaying sleep onset.
• The timing and intensity of light exposure throughout the day and evening may influence sleep-wake health.
• Photic countermeasures, such as adjusting light intensity and duration, could be applied flexibly to improve sleep outcomes.

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