This is the Second Edition of a book that has been very popular since its introduction in 2008. Since then there have been many studies that confirm that using ordinary light at night is damaging to sleep and increases the risk of deadly illnesses like diabetes, obesity, heart disease, and breast, colon and prostate cancer. The author introduces the dawning of a new epoch in lighting, "Lighting for Health." But this book is also a very personal book. It describes how the medical profession is slow to embrace new ideas without years of clinical testing but how simple changes in your life style...