Exposure to artificial light at the wrong times of day is one of the largest often-overlooked health risks of living in the 21st century. Blocking blue light serves an important biological purpose, helping to regulate your internal clock to control sleep patterns and other body functions; avoiding blue light at night is crucial to protecting your health. One of the least expensive and simplest ways to protect your body’s internal rhythm, and thereby support healthy sleep and a lowered risk of many chronic diseases, is to wear blue-light-blocking glasses at night.