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

Gooley JJ, Chamberlain K, Smith KA, et al. · Journal of Clinical Endocrinology & Metabolism 96(3):E463–E472 · 2011



## Key finding

Ordinary room light in the hours before bed suppressed melatonin in 99% of people and shortened its duration ~90 min.



[Read the paper](https://pubmed.ncbi.nlm.nih.gov/?term=Exposure+to+room+light+before+bedtime+suppresses+melatonin+onset+and+shortens+melatonin+duration+in+humans)

---
Educational summary of published research, not medical advice. Screening scores are not diagnoses. If a score is elevated or you feel unwell, talk to a clinician.

SleepShred for iPhone: https://apps.apple.com/app/id6802040541