Morning run: A and B people

What to know

What does it mean for our everyday lives to be an A or B person? Have you ever wondered why you always get tired before everyone else? Or why you can't stand the thought of going for an early morning run? It has something to do with circadian rhythms The vast majority of us are A or B people to a greater or lesser extent. The circadian rhythm, or the body's internal clock, is controlled by a complex center in the brain. Here, light plays a central, stabilizing role for the circadian rhythm. But what does the circadian rhythm actually mean for our everyday lives and well-being? How do we get enough light? And how do you fit running and exercise into a busy everyday life - whether you are an A or B person? Researcher in sleep and circadian rhythm disorders Mette Kraghmakes us more aware of how our internal clock, light, mobile screens and exercise can affect our mental and physical health.