Health has three main groups: nutrition, exercise and sleep. There are units of measurement for both nutrition and exercise and how you can stay within the optimum. For your weight that is the BMI and minimizing fat intake and for exercise that is, for example, a number of steps per day and the VO2 max. When it comes to sleep, it immediately becomes fuzzy. Suddenly it’s about pseudo science like ‘Don’t drink coffee’. ZERO ZONE Sleep sets a new standard in how you can have a sound sleep. Staying asleep is measurable.