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Wikipedia: Circadian rhythm
Core chronobiology article on SCN entrainment, zeitgebers, and phase response curves—useful scaffold for light-timing protocols.
Link to light protocols
Explains how melanopsin photoreception and phase advance/delay language map onto morning bright light and evening dim-light recommendations.
Evidence
Phototherapy lux levels and sleep timing shifts should be verified against RCT sources linked from circadian and morning-light protocol entries.
Outcomes
- sleep-onsetTertiary explainer; quantitative phase-shift claims require trial citations