Out of the blue? How the colour of light could be used to treat mental illness

Olivia Bennett
1 Min Read
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A psychiatric unit in Norway has been testing its built-in lighting on conditions such as psychosis and depression

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At first glance, the psychiatric ward in Trondheim looks much like any other unit caring for patients in acute mental distress. But as evening falls, filters descend over the windows, and the lights shift to a soft amber glow. By removing blue wavelengths that interfere with the body’s internal clock, doctors here are testing an unusual idea: that the design of the ward itself could become a form of treatment.

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Light is the main signal regulating the body’s circadian rhythm – the roughly 24-hour biological clock that governs sleep and many other bodily processes. Mounting evidence links circadian disruption to conditions including depression, cardiovascular disease and dementia, and disturbed sleep-wake cycles are a long-recognised feature of mental illness, particularly bipolar disorder.


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Olivia Bennett (she/her) is a health education specialist and medical writer dedicated to providing clear, evidence-based health information. She holds a strong academic background in public health and clinical sciences, with advanced training from respected institutions in the United States and the United Kingdom.   Bennett earned her Bachelor of Science in Public Health from the University of Michigan. She later completed her Doctor of Medicine (MD) at the Johns Hopkins University School of Medicine, where she developed a deep interest in preventive care and patient education.   To further strengthen her expertise in global and community health, she obtained a Master of Science in Global Health and Development from the University College London. She also completed a Postgraduate Certificate in Clinical Nutrition at the King's College London.   Since completing her studies, Bennett has worked in both clinical and health communication roles, contributing to medical blogs, health platforms, and public awareness campaigns. Her work focuses on translating complex medical research into practical guidance that everyday readers can understand and apply.   In 2021, she began specializing in digital health education, helping online health platforms maintain medically accurate, reader-friendly content. Her key areas of focus include: Preventive healthcare Women’s health Mental health awareness Chronic disease management (diabetes, hypertension) Nutrition and lifestyle medicine   Bennett believes that trustworthy health information should be accessible to everyone. Her goal is to empower readers to make informed decisions about their well-being through clear, compassionate, and research-backed guidance.   Outside of her professional work, she enjoys reading medical journals, participating in community wellness initiatives, and mentoring aspiring health writers.
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