Diseases such as diabetes and heart disease are associated with the length and timing of sleep; The importance of light or dark at the right time, melatonin, physical activity, and what and when you eat; How the right amount of melatonin entrains the circadian rhythm but high doses have negative side effects; The role of light intensity in the day compared to phones and computers at night that disrupt normal sleep patterns; Strategies for shift workers who are at higher risk for cardiovascular and other diseases; Lowering core temperature helps sleep and helps insomnia due to hormonal changes with menopause; What is the best form and sources of vitamin B12? The tricky issue of soy isoflavones and breast cancer risks post menopause; Suggestions for preventing kidney stones; An over-stimulated immune system may produce antibodies to viruses even if not exposed to them