Dr. Martin Moore-Ede

Circadian scientist and author

Circadian rhythms • light and health

2Episodes

89 minAnalysed

1Topic

Last reviewed: Jul 22, 2026·Credential: Physiologist; former Harvard Medical School professor·First indexed: Jul 22, 2026

About the expert

Focus: Light timing, Light colour, Body clock, Long-term health

A circadian scientist who spent 23 years as a professor at Harvard and led the lab credited with discovering the brain's master clock (the suprachiasmatic nucleus). He studies how the timing and colour of light affect the body clock. He is the author of a book on light and health and advocates matching light exposure to the natural day and night.

Why this matters

Circadian scientist known for work on light and the body clock, who also sells blue-light-reducing lighting products. His core claims about light affecting circadian timing and melatonin are well supported; his broader claim that modern lighting is a major driver of rising disease, such as obesity and breast cancer, goes substantially beyond current evidence. Separate the well-supported circadian science from the overextended disease claims, and weigh the commercial interest when the claims get strong.

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Topics covered

Sleep & Circadian Rhythm (Human)

Episodes with Dr. Martin Moore-Ede

Martin Moore-Ede: how light timing shapes your body clock and health

The body runs on a roughly 24-hour clock that takes its main cue from light. Bright, blue-rich light in the morning helps set this clock for the day. Darkness and dim, warm light in the evening let the body wind down for sleep. Modern life often reverses this, with dim indoor days and bright screens at night. This conversation looks at how the timing and colour of light reach the body clock, and why matching light to the natural day and night may support sleep and general health.

51 minHuman

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Does blue light at night really harm your health?

Your body has an internal clock that uses light to help set sleep and other daily rhythms. Light in the evening and at night can shift that clock and lower melatonin, the hormone that helps you sleep, and the effect depends on brightness, timing, duration, and wavelength. Blue-rich light can have a particularly strong effect on the clock, but blue light alone is not the whole story, and reducing bright evening light in general is a reasonable, low-risk habit. In this episode a circadian scientist goes much further, arguing that night-time blue light is a major cause of the obesity and breast cancer epidemics. That is a far stronger claim, and the evidence does not support it. He also sells lighting products designed to reduce blue light, which is worth weighing when judging how strongly the case is made.

38 minHuman

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