At every moment, sunlight is shaping your biology—whether you're in it or not. The Natural Light Prescription reveals how our modern indoor lives have left us starved of the very element that programs our sleep, mood, immunity, and energy. Grounded in established science and reviewed by leading health organisations, this book shows that the remedy is not more supplements or screens but something simpler: a thoughtful relationship with the sun. You’ll discover why morning light wakes up your brain, how midday exposure builds resilience, and why evening darkness matters just as much for a good night’s sleep. Learn the practical steps to design a daily light routine that fits your life—whether you work nights, live in northern climates, have sensitive skin, or simply spend long hours indoors. This is not about tanning or fear-mongering; it's about restoring the balance that modern architecture and technology have disrupted. From circadian rhythms and vitamin D to seasonal mood dips and immune modulation, each chapter offers clear, actionable guidance you can start using today. The Natural Light Prescription will change how you think about the oldest source of energy and healing on Earth. Part of The Sagewell Wellness Library.