In this powerful and eye-opening episode, Dave speaks with Theresa Bug, a former German police officer turned online health coach, holistic nutritionist, and advocate for natural light, grounding, and mitochondrial health.

🌿 Theresa shares her inspiring journey from a high-stress career in law enforcement—across Paris, London, Israel, and Africa—to deep healing through sunlight exposure, circadian rhythm restoration, and reconnecting with nature. Her story is a testament to the life-changing power of simple yet profound lifestyle changes.

💡 Key Topics Covered:

• How chronic stress and PTSD led her to holistic health
• The science behind morning sunlight and mitochondrial function
• Why grounding (earthing) and going barefoot can reset your nervous system
• The truth about blue light, screen time, and modern lighting
• The problems with supplement culture vs. real food and lifestyle
• How to eat seasonally and locally for optimal health and gut function
• Why gyms might be harming us more than helping—and how to exercise in harmony with nature
• Insights into raw milk, hydration, EMFs, red light, sleep, and ancestral living

☀️ This conversation explores how sunlight analysis, circadian health, and shadow-free living can transform your physical and mental health—especially in a world of artificial light, disconnected routines, and overprescribed medications.

To find out more about Theresa, her Website is a great starting point:

https://www.theresabug.com/home

or

Linkedin: https://www.linkedin.com/in/theresa-christinerangebased/

In this illuminating episode, we're joined by Austrian engineer Viktoria Neumueller, a passionate advocate for sunlight-optimized architecture and energy-efficient building design. With a background in planning heating, cooling, and ventilation systems, Viktoria brings rare insight into how thoughtful building orientation and solar exposure can dramatically reduce heating costs, enhance comfort, and even transform quality of life.

We dive deep into:

• Why shadow mapping and sunlight analysis should be a first step in architectural design
• How ignoring solar orientation can cost homeowners thousands over a building’s lifetime
• Viktoria's personal mission to help homeowners, builders, and architects rethink natural light integration
• The surprising resistance from the construction industry—and how she’s challenging it

Whether you're planning a new build, renovating a home, or simply fascinated by how sunlight and design intersect, this episode will inspire a new way of seeing your space.

In this episode, Dave chats with Professor Glen Jeffery, a neuroscientist at University College London’s Institute of Ophthalmology, whose research investigates how light, particularly long-wavelength red and infrared, influences human health, metabolism, and ageing.

Glen Jeffery is recognised as one of the world's leading researchers in exploring how light interacts with our bodies.

Glen explains how sunlight penetrates the body, enhancing mitochondrial function, improving vision, and even boosting motor skills like grip strength. He warns that modern LED lighting, while energy-efficient, can harm metabolic health compared to incandescent bulbs that emit beneficial infrared light.

They examine the public health consequences of our “infrared starvation,” the role of mitochondria in ageing, and the unexpectedly affordable potential solutions, such as rethinking indoor lighting and spending 20–30 minutes outdoors. Glen makes comparisons to historical issues like scurvy, emphasising the need for urgent policy reforms before our ageing, indoor-bound populations face worsening health crises. Practical advice includes seeking more natural light, using infrared-rich lighting where feasible, and adopting lifestyle changes that incorporate movement and sunlight exposure.

Dave speaks with Dr. Nicholas Witton, a sleep medicine and light researcher, about the critical role of natural light, especially near-infrared (NIR) light, in human health.

Nicholas explains how we've shifted from living outdoors to spending over 90% of our time indoors under artificial light, particularly LEDs, which emit mainly blue light and lack the full spectrum, including the NIR wavelengths that make up over 50% of solar energy.

They explore how NIR light supports mitochondrial function, ATP production, and glucose regulation, with implications for metabolic health, sleep, mood, and performance.

The conversation explores how modern lighting may contribute to chronic illness and what small changes—such as morning sun exposure or switching to incandescent bulbs—can make a meaningful difference.

This episode reframes sunlight as essential nutrition, not just illumination. If you're interested in sunlight analysis, real estate sun studies, shadow mapping, or optimizing your home for natural light exposure, this is a must-listen.

What if your home or office is silently shaping your health, your mood, and even your future? In this eye-opening episode, Dave sits down with Dr. Mandana Khanie, Lecturer in Health and Wellbeing in Sustainable Buildings at UCL and Deputy Director of the Light and Lighting MSc Program. Together, they explore how the architecture of our indoor lives, where we now spend 90% of our time, profoundly impacts our biological rhythms, mental health, and long-term wellness.

Mandana shares her unique journey from aspiring medical doctor to architectural engineer, and why reconnecting design with natural sunlight is essential to reversing modern public health trends. They discuss cutting-edge research on circadian rhythms, the unintended health risks of LED lighting, and how built environments could be reshaped with real sunlight exposure, shadow mapping, and human-centric design at the core.

This episode is a must-listen for anyone in architecture, urban planning, real estate, or simply passionate about wellness and sustainability. Tune in to hear how we can design buildings and cities that are not only energy-efficient but biologically nourishing.

In this illuminating episode of Sunlight Matters, David Wallace is joined by Niko Gentile and Agnieszka Czachura from Lund University’s Energy and Building Design group. Together, they explore the science, perception, and policy around sunlight and daylight, and why we need to care more than ever.

From the overlooked distinction between daylight and sunlight to the historical biases in building regulations, Niko and Aga take us on a fascinating journey. We discuss Agnieszka's new research into how people value sunlight in their homes today, revealing that although people still crave light, their reasons for doing so have shifted in our modern, thermally controlled, and urbanised world.

We also examine how energy-efficient building codes risk undermining human well-being, why real estate agents might be the best sunlight psychologists, and how the physics of glass may be blinding us to the sun’s full health benefits.

If you’ve ever felt better on a sunny day but didn’t know why, this episode is for you.

In this episode of Sunlight Matters, Dave welcomes daylight and lighting expert Paul Rogers of ACC Glass and Facade Consultants. Broadcasting from Stockholm and the UK, they explore the profound impact of sunlight and daylight on architecture, urban planning, and human well-being. From the technical distinctions between daylight and direct sunlight to the emotional resonance of a well-lit home, Paul shares decades of experience shaping buildings around solar exposure.

The episode touches on key topics like shadow mapping, solar orientation in real estate, sunlight in architectural history, and why tools like Shadowmap empower a new generation of homebuyers and city dwellers. An essential listen for architects, urban planners, sustainability advocates, and anyone curious about the sunlight in their lives.

In this episode of Sunlight Matters, hosts Dave and Georg welcome Swedish sleep and light researcher Arne Lowden for a fascinating conversation about the science of light, circadian rhythms, and how our bodies and minds are profoundly shaped by solar exposure.

Dr. Lowden, author of the book Survive the Winter, shares powerful insights into how lack of natural light affects sleep, mood, and long-term health, especially in northern climates. We explore the hidden costs of indoor living, the realities of “social jet lag,” and the rising demand for light therapy as a natural solution to Seasonal Affective Disorder (SAD).

Whether you're designing a sun-filled home, optimizing your daily habits, or just trying to shake the winter blues, this episode offers practical, research-backed guidance to help you reconnect with the sun and realign with your natural rhythm.

What We Cover in This Episode:

• Why sunlight matters for physical and mental health
• How snow cover increases daylight exposure in winter
• The link between circadian rhythms and modern urban life
• Light therapy tips for beating seasonal depression
• How teenagers, shift workers, and the elderly are impacted by light deprivation
• The role of architecture and home design in maximizing natural light
• When to use blue light and when to avoid it
• Is red light therapy worth the hype?
• Why even 10 minutes of daylight in the morning matters.

So find your spot in the sun, tune in, and give it a listen!

Arne's book Överlev vintern, gives tips and advice on how to stay alert, sleep well and maintain a good mood even during the dark season. It can be found here: https://www.bokforlagetpolaris.se/oeverlev-vintern/t-0/9789180662611