Exposure to room light before bedtime suppresses melatonin onset and shortens melatonin duration in humans

What this work gives Aellic

Retrospective analysis of laboratory data, 116 healthy adults aged 18–30: room light (under 200 lux) versus dim light (under 3 lux) in the 8 h before bedtime delayed melatonin onset in 99 % of individuals and shortened melatonin duration by about 90 min. Graded observational because it is a retrospective comparison across two studies, not a randomised trial.

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